Homemade Double Chocolate Zucchini Muffins

I didn’t know zucchini could hide in chocolate muffins until my neighbor handed me a bag of garden zucchini the size of baseball bats. I’m talking those monster zukes that sneak up on you in August when you’re not paying attention.

At first, I thought I’d make zucchini bread like everyone else. But then I remembered my kids actually fight over chocolate muffins at breakfast. Zucchini bread? Not so much. So I figured, why not add cocoa powder and chocolate chips? Turns out, when you bury vegetables in enough chocolate, nobody asks questions. They just eat three muffins before you can stop them.

What Kind of Zucchini Should I Use?

Any type of zucchini will work great in these muffins, whether you have dark green, light green, or even yellow summer squash on hand. Medium-sized zucchini are your best bet since they’re easier to grate and tend to have fewer seeds than the really large ones. The key thing to remember is that you’ll need to squeeze out the excess moisture after grating – just wrap the shredded zucchini in a clean kitchen towel or paper towels and give it a good squeeze over the sink. Don’t worry if your zucchini is a bit older and the skin is tougher, you can still use it since you’ll be grating it up anyway and it’ll disappear right into the batter.

Options for Substitutions

These muffins are pretty forgiving when it comes to swapping ingredients:

• All purpose flour: You can use whole wheat flour for a healthier option, though the muffins will be a bit denser. A 50/50 mix of all purpose and whole wheat works well too.
• Avocado oil: Any neutral oil works here – vegetable oil, canola oil, or melted coconut oil are all good choices. You can even use melted butter for a richer flavor.
• Milk: Regular milk, almond milk, oat milk, or buttermilk all work fine. If using buttermilk, your muffins will be extra moist.
• Granulated sugar: You can swap this with coconut sugar or brown sugar for a deeper flavor. Honey or maple syrup work too, but reduce the milk by 2 tablespoons to balance the extra liquid.
• Zucchini: Yellow squash is a great substitute and works exactly the same way. Make sure to squeeze out the excess moisture no matter which you use.
• Chocolate chips: Mix it up with dark chocolate chips, white chocolate chips, or even chopped nuts like walnuts or pecans for some crunch.

Watch Out for These Mistakes While Baking

The biggest mistake people make with zucchini muffins is skipping the step of squeezing out excess moisture from the grated zucchini, which leads to dense, soggy muffins that never quite bake through properly – use a clean kitchen towel or paper towels to wring out as much liquid as possible.

Overmixing the batter once you add the dry ingredients to the wet is another common error that creates tough, rubbery muffins, so stir just until the flour disappears and you still see a few lumps.

Don’t overbake these muffins trying to get a clean toothpick test, because the chocolate chips will make the tester look wet even when the muffins are done – instead, look for the tops to spring back when lightly pressed and remove them right at 20 minutes for the moistest results.

What to Serve With Double Chocolate Zucchini Muffins?

These muffins are perfect for breakfast alongside a hot cup of coffee or a cold glass of milk – the chocolate makes them feel like a treat, but the zucchini keeps things a bit healthier. I love packing them in lunchboxes with some fresh fruit like strawberries or apple slices to balance out the sweetness. They also make a great afternoon snack with a smear of peanut butter or almond butter on top, which adds some protein and makes them more filling. For a weekend brunch spread, set them out with yogurt parfaits and fresh berries for a nice mix of flavors and textures.

Storage Instructions

Store: Keep your double chocolate zucchini muffins in an airtight container at room temperature for up to 3 days, or in the fridge for up to a week. The zucchini actually helps keep them moist, so they taste great even after a few days!

Freeze: These muffins are perfect for freezing. Let them cool completely, then wrap each one individually in plastic wrap and store in a freezer bag for up to 3 months. I love having a stash ready for quick breakfasts or afternoon snacks.

Thaw: Just leave a frozen muffin on the counter for about an hour to thaw, or microwave it for 20-30 seconds if you’re in a hurry. You can also warm them in a 300°F oven for about 10 minutes if you want that fresh-baked feel again.

Estimated Nutrition

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

• Calories: 2900-3200
• Protein: 30-36 g
• Fat: 140-155 g
• Carbohydrates: 380-410 g

Ingredients

For the dry mixture:

• 1 1/2 cups flour
• 1/2 cup cocoa powder
• 1 tsp baking powder
• 1/2 tsp baking soda
• 3/4 tsp salt
• 1/2 tsp ground cinnamon
• 1/2 tsp instant espresso powder

For the wet mixture:

• 2 eggs
• 1 cup sugar
• 1/2 cup milk
• 1/2 cup oil
• 1 tablespoon vanilla extract

For the mix-ins:

• 1 1/2 cups zucchini (finely shredded and squeezed dry)
• 1 1/4 cups semi-sweet chocolate chips

Step 1: Prepare Zucchini and Preheat Oven

• 1 1/2 cups zucchini

Finely shred the zucchini using a box grater or food processor, then place it in a clean kitchen towel and squeeze firmly to remove as much moisture as possible—this is crucial for preventing wet, dense muffins.

While you’re working on the zucchini, preheat your oven to 375°F and line a standard 12-cup muffin tin with paper liners or grease it well.

Step 2: Mix Dry Ingredients

• 1 1/2 cups flour
• 1/2 cup cocoa powder
• 1 tsp baking powder
• 1/2 tsp baking soda
• 3/4 tsp salt
• 1/2 tsp ground cinnamon
• 1/2 tsp instant espresso powder

In a medium bowl, whisk together the flour, cocoa powder, baking powder, baking soda, salt, cinnamon, and instant espresso powder.

Whisking rather than just stirring helps distribute the leavening agents evenly and breaks up any cocoa lumps, which ensures consistent chocolate flavor throughout the muffins.

Set this dry mixture aside.

Step 3: Create Wet Ingredient Base

• 2 eggs
• 1 cup sugar
• 1/2 cup milk
• 1/2 cup oil
• 1 tablespoon vanilla extract

In a large bowl, whisk together the eggs, sugar, milk, oil, and vanilla extract until well combined and slightly lighter in color.

This aerates the mixture slightly and helps create a more tender crumb.

I like to add the vanilla last and stir it in gently—it helps preserve the delicate aroma that will enhance the chocolate flavor in the finished muffins.

Step 4: Combine Wet and Dry Ingredients

• dry ingredient mixture from Step 2
• wet ingredient mixture from Step 3

Pour the dry ingredient mixture from Step 2 into the wet ingredient base from Step 3.

Using a spatula or wooden spoon, fold the dry ingredients into the wet ingredients with just a few gentle strokes until the flour mixture is barely visible—overmixing at this stage develops gluten and results in tough, dense muffins.

A few small lumps are completely fine and actually desirable.

Step 5: Fold in Zucchini and Chocolate Chips

• prepared zucchini from Step 1
• 1 1/4 cups semi-sweet chocolate chips

Gently fold the squeezed-dry zucchini from Step 1 and the chocolate chips into the batter using just a few strokes until evenly distributed.

The zucchini adds moisture and a subtle earthiness that deepens the chocolate flavor, while the chips create pockets of melted chocolate throughout.

Don’t overstir—keep the batter slightly lumpy for the best texture.

Step 6: Fill and Bake Muffins

Divide the batter evenly among the prepared muffin cups, filling each about three-quarters full.

This leaves room for the muffins to rise without overflowing.

Bake in your preheated 375°F oven for 18-22 minutes, until a toothpick inserted into the center of a muffin comes out with just a few moist crumbs (not wet batter, but not completely dry either—those moist crumbs are from the melted chocolate, which keeps these muffins wonderfully tender).

Step 7: Cool and Serve

Remove the muffin tin from the oven and let the muffins cool in the tin for about 5 minutes, then turn them out onto a wire rack to cool completely.

This allows them to set up while retaining their tender crumb.

Serve at room temperature or slightly warm for the best chocolate flavor and texture.

Homemade Double Chocolate Zucchini Muffins

Delicious Homemade Double Chocolate Zucchini Muffins recipe with step-by-step instructions.

Print Recipe Pin Recipe

Prep Time 15 minutes mins

Cook Time 25 minutes mins

Total Time 40 minutes mins

Servings: 12 muffins

Calories: 3050

Ingredients Method

Ingredients

  

For the dry mixture:

• 1 1/2 cups flour
• 1/2 cup cocoa powder
• 1 tsp baking powder
• 1/2 tsp baking soda
• 3/4 tsp salt
• 1/2 tsp ground cinnamon
• 1/2 tsp instant espresso powder

For the wet mixture:

• 2 eggs
• 1 cup sugar
• 1/2 cup milk
• 1/2 cup oil
• 1 tablespoon vanilla extract

For the mix-ins:

• 1 1/2 cups zucchini (finely shredded and squeezed dry)
• 1 1/4 cups semi-sweet chocolate chips

Method

 

1. Finely shred the zucchini using a box grater or food processor, then place it in a clean kitchen towel and squeeze firmly to remove as much moisture as possible—this is crucial for preventing wet, dense muffins. While you're working on the zucchini, preheat your oven to 375°F and line a standard 12-cup muffin tin with paper liners or grease it well.
2. In a medium bowl, whisk together the flour, cocoa powder, baking powder, baking soda, salt, cinnamon, and instant espresso powder. Whisking rather than just stirring helps distribute the leavening agents evenly and breaks up any cocoa lumps, which ensures consistent chocolate flavor throughout the muffins. Set this dry mixture aside.
3. In a large bowl, whisk together the eggs, sugar, milk, oil, and vanilla extract until well combined and slightly lighter in color. This aerates the mixture slightly and helps create a more tender crumb. I like to add the vanilla last and stir it in gently—it helps preserve the delicate aroma that will enhance the chocolate flavor in the finished muffins.
4. Pour the dry ingredient mixture from Step 2 into the wet ingredient base from Step 3. Using a spatula or wooden spoon, fold the dry ingredients into the wet ingredients with just a few gentle strokes until the flour mixture is barely visible—overmixing at this stage develops gluten and results in tough, dense muffins. A few small lumps are completely fine and actually desirable.
5. Gently fold the squeezed-dry zucchini from Step 1 and the chocolate chips into the batter using just a few strokes until evenly distributed. The zucchini adds moisture and a subtle earthiness that deepens the chocolate flavor, while the chips create pockets of melted chocolate throughout. Don't overstir—keep the batter slightly lumpy for the best texture.
6. Divide the batter evenly among the prepared muffin cups, filling each about three-quarters full. This leaves room for the muffins to rise without overflowing. Bake in your preheated 375°F oven for 18-22 minutes, until a toothpick inserted into the center of a muffin comes out with just a few moist crumbs (not wet batter, but not completely dry either—those moist crumbs are from the melted chocolate, which keeps these muffins wonderfully tender).
7. Remove the muffin tin from the oven and let the muffins cool in the tin for about 5 minutes, then turn them out onto a wire rack to cool completely. This allows them to set up while retaining their tender crumb. Serve at room temperature or slightly warm for the best chocolate flavor and texture.