Delicious Shredded Zucchini and Ground Beef Casserole

I didn’t grow up eating zucchini casseroles—honestly, my mom wasn’t really into sneaking vegetables into dinner. But now that I’m trying to get my kids to eat more veggies without a fight, this casserole has become my secret weapon.

The trick is shredding the zucchini so fine that it basically melts into the dish. You salt it first to pull out the extra water (trust me on this one—skip this step and you’ll end up with a watery mess). Then you mix it with eggs and cheese to create a base that’s kind of like a crust, but easier. Top it with seasoned ground beef, mushrooms, and pasta sauce, and suddenly you’ve got a dinner that tastes like comfort food but actually has vegetables in it. My kids ask for seconds, and I don’t have to beg them to eat their greens.

What Kind of Zucchini Should I Use?

For this casserole, you’ll want to grab small to medium-sized zucchini rather than those giant ones you sometimes see at the farmer’s market. The smaller zucchini tend to have fewer seeds and a better texture, plus they’re not as watery as the oversized ones. Green zucchini is the most common choice, but yellow summer squash works just as well if that’s what you have on hand. The most important step is making sure you squeeze out as much moisture as possible after shredding and salting your zucchini – otherwise you’ll end up with a soggy casserole instead of a nice, firm base.

Options for Substitutions

This casserole is pretty forgiving when it comes to swaps, so feel free to work with what you have:

• Zucchini: Yellow squash works perfectly in place of zucchini – just shred it the same way and salt it to draw out moisture. You can also try shredded eggplant, though you’ll want to squeeze out even more liquid.
• Ground beef: As mentioned, ground pork, turkey, chicken, or Italian sausage (casings removed) all work great here. Just adjust your seasoning if using sausage since it’s already seasoned.
• Parmesan cheese: Romano or asiago cheese make good substitutes and bring a similar sharp, salty flavor to the dish.
• Cheddar cheese: Mozzarella, Monterey Jack, or a Mexican cheese blend all melt nicely. You can also mix different cheeses together for more flavor.
• Pasta sauce: If you don’t have jarred sauce, use a 15-ounce can of tomato sauce mixed with Italian seasoning and a bit of garlic powder. Alfredo sauce creates a totally different but tasty version too.
• Mushrooms and bell peppers: These veggies are flexible – swap in what you like or have on hand. Diced tomatoes, spinach, or even broccoli florets work well. Just keep the total veggie amount similar.

Watch Out for These Mistakes While Baking

The biggest mistake you can make with this casserole is skipping the salting step for the zucchini, which draws out excess moisture – if you don’t let it sit for the full 15 minutes and squeeze it really dry with paper towels, you’ll end up with a watery, soggy crust that won’t hold together.

Another common error is not pressing the zucchini mixture firmly enough into the pan before baking, so use the back of a spoon or your hands to pack it down tightly for a sturdy base.

Make sure to drain any grease from the ground beef mixture before adding the sauce, otherwise the casserole will be greasy and the flavors won’t come through as well.

Finally, resist the urge to cut into the casserole right away – letting it rest for the full 10 minutes allows everything to set up properly, making it much easier to slice into clean portions.

What to Serve With Zucchini and Ground Beef Casserole?

This casserole is pretty hearty on its own, so I like to keep the sides simple and fresh. A crisp green salad with a light vinaigrette is perfect for balancing out all the cheesy goodness, and some garlic bread or warm dinner rolls are great for anyone who wants a little extra carbs on their plate. If you’re feeding a crowd, roasted green beans or steamed broccoli make easy veggie sides that don’t require much effort. Sometimes I’ll even just serve it with a simple cucumber and tomato salad dressed with olive oil and lemon juice to keep things light and refreshing.

Storage Instructions

Store: This casserole keeps really well in the fridge for up to 4 days in an airtight container. It’s one of those dishes that actually tastes even better the next day after all the flavors have had time to hang out together. Perfect for making on Sunday and eating throughout the week!

Freeze: You can freeze this casserole either before or after baking. If freezing unbaked, assemble everything and cover tightly with plastic wrap and foil for up to 3 months. For already-baked casserole, let it cool completely, then portion it out or freeze the whole thing for up to 2 months.

Reheat: Warm up individual portions in the microwave for 2-3 minutes, or reheat the whole casserole covered with foil in a 350°F oven for about 20-25 minutes until heated through. If reheating from frozen, thaw it in the fridge overnight first for best results.

Estimated Nutrition

Estimated nutrition for the whole recipe (without optional ingredients):

• Calories: 3250-3500
• Protein: 220-240 g
• Fat: 210-230 g
• Carbohydrates: 80-100 g

Ingredients

For the zucchini base:

• Cooking spray (I prefer Pam Olive Oil spray for easy release)
• 1.3 lb zucchini (shredded and squeezed dry to prevent a soggy base)
• 1 tablespoon salt (for moisture extraction)
• 4 large eggs
• 1 1/3 cups parmesan cheese
• 3 cups cheddar cheese
• 1/2 teaspoon garlic powder

For the beef topping:

• 2 tablespoons olive oil
• 1 1/2 lb lean ground beef
• 1 cup onion (diced into 1/2-inch pieces)
• 2 cups sliced mushrooms
• 3/4 cup bell peppers
• 24 oz pasta sauce (I use Rao’s Homemade for the best flavor)
• 2 tablespoons italian seasoning
• 1/4 teaspoon crushed red pepper flakes
• 2 cups sharp cheddar cheese (such as Kerrygold)

Step 1: Prepare the Zucchini Base

• Cooking spray
• 1.3 lb zucchini
• 1 tablespoon salt

Preheat your oven to 400°F and spray a 9×13 inch baking dish with cooking spray.

While the oven preheats, place your shredded zucchini in a fine-mesh strainer and toss with 1 tablespoon of salt.

Let it sit for 15 minutes to extract moisture—this is crucial for preventing a soggy casserole.

After 15 minutes, squeeze the zucchini firmly with paper towels or a clean kitchen towel to remove as much liquid as possible; don’t skip this step as it makes a real difference in the final texture.

Step 2: Build the Zucchini Crust

• 4 large eggs
• 1 1/3 cups parmesan cheese
• 3 cups cheddar cheese
• 1/2 teaspoon garlic powder
• shredded zucchini from Step 1

In a large mixing bowl, whisk together the eggs, parmesan cheese, and 3 cups cheddar cheese until well combined.

Add the garlic powder and stir to incorporate.

Fold in the dried zucchini from Step 1 until evenly distributed throughout the egg mixture.

Press this mixture firmly into the prepared baking dish, creating an even layer that will serve as your casserole base.

Bake for 25 minutes until the crust is set and lightly golden.

Step 3: Prepare the Seasoned Meat Sauce

• 2 tablespoons olive oil
• 1 cup onion
• 2 cups sliced mushrooms
• 1.5 lb lean ground beef
• 3/4 cup bell peppers

While the crust bakes, heat 2 tablespoons of olive oil in a large skillet over medium-high heat.

Add the diced onions and sliced mushrooms, cooking for 4-5 minutes until they begin to soften and release their moisture.

Add the ground beef and cook, breaking it up as it browns, until no pink remains (about 7-8 minutes).

I like to use a wooden spoon to break the meat into small pieces for more even cooking and better texture throughout the sauce.

Stir in the bell peppers and cook for another 2-3 minutes, then drain any excess liquid from the skillet.

Step 4: Finish the Meat Sauce

• 24 oz pasta sauce
• 2 tablespoons italian seasoning
• 1/4 teaspoon crushed red pepper flakes
• meat mixture from Step 3

Pour the pasta sauce into the skillet with the cooked meat mixture from Step 3.

Add the Italian seasoning and crushed red pepper flakes, stirring well to combine all ingredients evenly.

Let the sauce simmer for 2-3 minutes to meld the flavors together.

Taste and adjust seasonings as needed—I find that the Rao’s sauce is already flavorful, so you might not need additional salt.

Step 5: Assemble and Final Bake

• baked zucchini crust from Step 2
• meat sauce from Step 4
• 2 cups sharp cheddar cheese

Remove the baked zucchini crust from the oven and spread the meat sauce from Step 4 evenly over the top.

Sprinkle the 2 cups of sharp cheddar cheese over the sauce layer.

Return the casserole to the oven and bake for 5 minutes until the cheese is just melted and bubbly.

Remove from the oven and let the casserole rest for 10 minutes before cutting—this allows the layers to set and makes serving much cleaner.

Delicious Shredded Zucchini and Ground Beef Casserole

Delicious Delicious Shredded Zucchini and Ground Beef Casserole recipe with step-by-step instructions.

Print Recipe Pin Recipe

Prep Time 20 minutes mins

Cook Time 40 minutes mins

Total Time 1 hour hr

Servings: 8 servings

Calories: 3375

Ingredients Method

Ingredients

  

For the zucchini base

• Cooking spray (I prefer Pam Olive Oil spray for easy release)
• 1.3 lb zucchini (shredded and squeezed dry to prevent a soggy base)
• 1 tablespoon salt (for moisture extraction)
• 4 large eggs
• 1 1/3 cups parmesan cheese
• 3 cups cheddar cheese
• 1/2 teaspoon garlic powder

For the beef topping

• 2 tablespoons olive oil
• 1 1/2 lb lean ground beef
• 1 cup onion (diced into 1/2-inch pieces)
• 2 cups sliced mushrooms
• 3/4 cup bell peppers
• 24 oz pasta sauce (I use Rao’s Homemade for the best flavor)
• 2 tablespoons italian seasoning
• 1/4 teaspoon crushed red pepper flakes
• 2 cups sharp cheddar cheese (such as Kerrygold)

Method

 

1. Preheat your oven to 400°F and spray a 9x13 inch baking dish with cooking spray. While the oven preheats, place your shredded zucchini in a fine-mesh strainer and toss with 1 tablespoon of salt. Let it sit for 15 minutes to extract moisture—this is crucial for preventing a soggy casserole. After 15 minutes, squeeze the zucchini firmly with paper towels or a clean kitchen towel to remove as much liquid as possible; don't skip this step as it makes a real difference in the final texture.
2. In a large mixing bowl, whisk together the eggs, parmesan cheese, and 3 cups cheddar cheese until well combined. Add the garlic powder and stir to incorporate. Fold in the dried zucchini from Step 1 until evenly distributed throughout the egg mixture. Press this mixture firmly into the prepared baking dish, creating an even layer that will serve as your casserole base. Bake for 25 minutes until the crust is set and lightly golden.
3. While the crust bakes, heat 2 tablespoons of olive oil in a large skillet over medium-high heat. Add the diced onions and sliced mushrooms, cooking for 4-5 minutes until they begin to soften and release their moisture. Add the ground beef and cook, breaking it up as it browns, until no pink remains (about 7-8 minutes). I like to use a wooden spoon to break the meat into small pieces for more even cooking and better texture throughout the sauce. Stir in the bell peppers and cook for another 2-3 minutes, then drain any excess liquid from the skillet.
4. Pour the pasta sauce into the skillet with the cooked meat mixture from Step 3. Add the Italian seasoning and crushed red pepper flakes, stirring well to combine all ingredients evenly. Let the sauce simmer for 2-3 minutes to meld the flavors together. Taste and adjust seasonings as needed—I find that the Rao's sauce is already flavorful, so you might not need additional salt.
5. Remove the baked zucchini crust from the oven and spread the meat sauce from Step 4 evenly over the top. Sprinkle the 2 cups of sharp cheddar cheese over the sauce layer. Return the casserole to the oven and bake for 5 minutes until the cheese is just melted and bubbly. Remove from the oven and let the casserole rest for 10 minutes before cutting—this allows the layers to set and makes serving much cleaner.