Delicious Chicken Casserole with Shredded Zucchini

Finding a weeknight dinner that’s both healthy and satisfying can feel like an impossible task, especially when you’re short on time and need something the whole family will actually eat. Between work schedules, after-school activities, and the general chaos of evening routines, elaborate meals just aren’t realistic most nights.

That’s exactly why this chicken casserole with shredded zucchini has become one of my most-made recipes. It sneaks in plenty of vegetables without anyone complaining, comes together in one dish for easy cleanup, and tastes comforting enough that even picky eaters go back for seconds. Plus, you can prep it ahead and just pop it in the oven when you’re ready to eat.

What Kind of Zucchini Should I Use?

For this casserole, medium-sized zucchini work best since they tend to have fewer seeds and less water content than the really large ones. If you can only find bigger zucchini at the store, that’s totally fine – just be sure to squeeze out as much moisture as possible after grating to prevent your casserole from getting watery. You can use green zucchini, yellow summer squash, or a mix of both for some extra color. One helpful tip: after grating your zucchini, sprinkle it with a bit of salt and let it sit for about 10 minutes, then squeeze it in a clean kitchen towel to remove excess liquid before adding it to your casserole mixture.

Options for Substitutions

This casserole is really forgiving when it comes to swapping ingredients:

• Ground chicken: Ground turkey works just as well here and has a similar texture. You could also use ground beef or pork, though they’ll add a bit more fat to the dish – just drain any excess after cooking.
• Zucchini: Yellow squash is a great substitute and cooks the same way. Make sure to squeeze out the excess moisture from whatever you use, or your casserole will turn out watery.
• Sour cream: Greek yogurt or plain yogurt work perfectly if you’re out of sour cream. You can also use cream cheese (softened) for a richer texture.
• Cheddar or Colby Jack cheese: Monterey Jack, mozzarella, or a Mexican cheese blend all melt nicely in this recipe. Use whatever you have in your fridge.
• Carrot: If you don’t have carrots, you can add more zucchini or try grated bell peppers for some color and crunch.
• Italian herb spice: No Italian seasoning? Mix together whatever dried herbs you have – basil, oregano, and thyme work great. Even just garlic powder and dried parsley will do the trick.

Watch Out for These Mistakes While Baking

The biggest mistake you can make with this casserole is skipping the step of salting and squeezing the zucchini – if you don’t remove that excess moisture, you’ll end up with a watery, soupy mess instead of a firm casserole. When squeezing the zucchini, really go for it and press hard using a clean kitchen towel or cheesecloth until no more liquid comes out, even if you think you’ve gotten enough. Don’t add the cheese too early either, as putting it on from the start can cause it to brown too much or even burn before the casserole is fully cooked through. If your casserole still seems loose after baking, let it rest for 10 minutes before serving, which gives it time to firm up and makes slicing much cleaner.

What to Serve With Chicken Casserole?

This chicken and zucchini casserole is pretty filling on its own, but I love serving it with a simple side salad dressed with olive oil and lemon juice to keep things fresh and light. A crusty baguette or some warm dinner rolls are perfect for anyone who wants a little extra something on their plate. If you’re feeding a crowd or want to make it more of a complete meal, roasted vegetables like bell peppers, broccoli, or green beans work really well alongside this casserole. You could also serve it over rice or quinoa if you want to stretch it further for leftovers throughout the week.

Storage Instructions

Store: This casserole keeps really well in the fridge for up to 4 days in an airtight container. I actually think it tastes even better the next day after all the flavors have had time to meld together. Just make sure to let it cool completely before covering and storing.

Freeze: You can freeze this casserole for up to 3 months, either as a whole dish or in individual portions. I like to portion it out in meal-sized containers so I can grab just what I need for lunch or dinner without thawing the whole thing.

Reheat: Warm it up in the microwave for a few minutes, or pop it back in the oven at 350°F until heated through. If it seems a bit dry after reheating, just add a dollop of sour cream on top to bring back that creamy texture.

Estimated Nutrition

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

• Calories: 1100-1250
• Protein: 75-85 g
• Fat: 75-85 g
• Carbohydrates: 35-45 g

Ingredients

For the main mixture:

• 16 oz ground chicken
• 1 lb zucchini (grated and squeezed firmly to remove excess moisture)
• 1 medium carrot, grated
• 1 small onion, finely diced
• 1 large egg
• 1 tsp garlic powder
• 1/2 tsp smoked paprika
• 3/4 tsp black pepper
• 1/2 tsp salt
• 1.5 tsp italian seasoning

For the topping:

• 4 tbsp sour cream
• 1.5 cups cheddar (shredded from the block for better melting)
• 1/4 cup grated parmesan cheese

For the garnish (optional):

• fresh parsley
• scallions
• bacon bits (optional, adds a smoky crunch)

Step 1: Prepare the Zucchini Base

• 1 lb zucchini
• 1/2 tsp salt
• 1 medium carrot, grated
• 1 small onion, finely diced

Grate the zucchini and place it in a colander or fine-mesh strainer set over a bowl.

Sprinkle with salt and let sit for 10-15 minutes—this draws out excess moisture that would otherwise make the casserole watery.

After the time has passed, gather the zucchini in a clean kitchen towel or cheesecloth and squeeze firmly, wringing out as much liquid as possible.

This step is crucial for texture, so don’t skip the squeezing!

While the zucchini drains, grate the carrot and finely dice the onion, setting them aside.

Step 2: Build the Protein and Seasoning Mixture

• 16 oz ground chicken
• prepared vegetables from Step 1
• 1 large egg
• 1 tsp garlic powder
• 1/2 tsp smoked paprika
• 3/4 tsp black pepper
• 1/2 tsp salt
• 1.5 tsp italian seasoning

In a large mixing bowl, combine the ground chicken with the squeezed zucchini, grated carrot, and diced onion from Step 1.

Add the egg, which acts as a binder to hold everything together.

Sprinkle in the garlic powder, smoked paprika, black pepper, salt, and Italian seasoning, mixing everything together gently but thoroughly until just combined—avoid overworking the mixture, which can make the casserole dense.

I prefer to use my hands for this to ensure even distribution of seasonings, which gives a more consistent flavor throughout every bite.

Step 3: Preheat and Assemble the Casserole

• protein and seasoning mixture from Step 2
• 4 tbsp sour cream

Heat your oven to 400°F.

While the oven preheats, lightly grease a 9×13 inch baking dish or similar-sized casserole dish.

Transfer the chicken mixture from Step 2 into the prepared dish and use a spatula or the back of a spoon to level and pack it down gently into an even layer.

Spread the sour cream evenly over the top of the mixture—this will create a creamy layer that helps keep the casserole moist during baking.

Step 4: Bake and Add Cheese

• 1.5 cups cheddar, shredded
• 1/4 cup grated parmesan cheese

Place the casserole in the preheated 400°F oven and bake for 35 minutes, until the chicken is cooked through and the top is lightly browned.

Remove from the oven and evenly distribute the shredded cheddar and grated Parmesan cheese over the top—I like to use cheddar shredded from a block rather than pre-shredded, as it melts more smoothly without the anti-caking agents.

Return to the oven and bake for another 10 minutes until the cheese is melted and bubbly.

Step 5: Finish and Serve

• fresh parsley, chopped
• scallions, sliced
• bacon bits

Remove the casserole from the oven and let it rest for 5 minutes before serving—this allows the residual heat to set the structure.

Garnish generously with fresh chopped parsley and sliced scallions for brightness and color.

If using bacon bits, sprinkle them over the top for added smoky crunch and a professional finish.

Serve warm directly from the dish or portion into individual bowls.

Delicious Chicken Casserole with Shredded Zucchini

Delicious Delicious Chicken Casserole with Shredded Zucchini recipe with step-by-step instructions.

Print Recipe Pin Recipe

Prep Time 25 minutes mins

Cook Time 50 minutes mins

Total Time 1 hour hr 17 minutes mins

Servings: 6 servings

Calories: 1175

Ingredients Method

Ingredients

  

For the main mixture:

• 16 oz ground chicken
• 1 lb zucchini (grated and squeezed firmly to remove excess moisture)
• 1 medium carrot, grated
• 1 small onion, finely diced
• 1 large egg
• 1 tsp garlic powder
• 1/2 tsp smoked paprika
• 3/4 tsp black pepper
• 1/2 tsp salt
• 1.5 tsp italian seasoning

For the topping:

• 4 tbsp sour cream
• 1.5 cups cheddar (shredded from the block for better melting)
• 1/4 cup grated parmesan cheese

For the garnish (optional):

• fresh parsley
• scallions
• bacon bits (optional, adds a smoky crunch)

Method

 

1. Grate the zucchini and place it in a colander or fine-mesh strainer set over a bowl. Sprinkle with salt and let sit for 10-15 minutes—this draws out excess moisture that would otherwise make the casserole watery. After the time has passed, gather the zucchini in a clean kitchen towel or cheesecloth and squeeze firmly, wringing out as much liquid as possible. This step is crucial for texture, so don't skip the squeezing! While the zucchini drains, grate the carrot and finely dice the onion, setting them aside.
2. In a large mixing bowl, combine the ground chicken with the squeezed zucchini, grated carrot, and diced onion from Step 1. Add the egg, which acts as a binder to hold everything together. Sprinkle in the garlic powder, smoked paprika, black pepper, salt, and Italian seasoning, mixing everything together gently but thoroughly until just combined—avoid overworking the mixture, which can make the casserole dense. I prefer to use my hands for this to ensure even distribution of seasonings, which gives a more consistent flavor throughout every bite.
3. Heat your oven to 400°F. While the oven preheats, lightly grease a 9x13 inch baking dish or similar-sized casserole dish. Transfer the chicken mixture from Step 2 into the prepared dish and use a spatula or the back of a spoon to level and pack it down gently into an even layer. Spread the sour cream evenly over the top of the mixture—this will create a creamy layer that helps keep the casserole moist during baking.
4. Place the casserole in the preheated 400°F oven and bake for 35 minutes, until the chicken is cooked through and the top is lightly browned. Remove from the oven and evenly distribute the shredded cheddar and grated Parmesan cheese over the top—I like to use cheddar shredded from a block rather than pre-shredded, as it melts more smoothly without the anti-caking agents. Return to the oven and bake for another 10 minutes until the cheese is melted and bubbly.
5. Remove the casserole from the oven and let it rest for 5 minutes before serving—this allows the residual heat to set the structure. Garnish generously with fresh chopped parsley and sliced scallions for brightness and color. If using bacon bits, sprinkle them over the top for added smoky crunch and a professional finish. Serve warm directly from the dish or portion into individual bowls.