Costco Double Chocolate Muffins

Why You’ll Love This Recipe

• Just like the iconic Costco muffins—moist, rich, and jumbo-sized
• Loaded with cocoa and chocolate chips for double chocolate flavor
• Perfect for breakfast, snacking, or dessert
• Easy to make with simple baking ingredients
• Freezer-friendly for batch baking
• No mixer required
• Can be made in standard or jumbo muffin tins
• Great for sharing or bake sales
• Bakery-style muffins at home
• Satisfies any chocolate craving

Ingredients

(Tip: You’ll find the full list of ingredients and measurements in the recipe card below.)

• All-purpose flour
• Unsweetened cocoa powder
• Baking powder
• Baking soda
• Salt
• Eggs
• Granulated sugar
• Brown sugar
• Sour cream or Greek yogurt
• Milk
• Vegetable oil
• Vanilla extract
• Chocolate chips or chunks (semi-sweet or dark)

Directions

1. Preheat the oven to 375°F (190°C). Line a muffin tin with paper liners or grease well. Use a jumbo muffin tin for true Costco-style muffins.
2. In a large bowl, whisk together flour, cocoa powder, baking powder, baking soda, and salt.
3. In another bowl, whisk eggs, granulated sugar, and brown sugar until combined.
4. Add sour cream, milk, oil, and vanilla extract to the wet ingredients and mix until smooth.
5. Gradually add the dry ingredients to the wet mixture, stirring just until combined. Do not overmix.
6. Fold in chocolate chips, reserving some for topping if desired.
7. Divide the batter evenly into the muffin cups, filling each about ¾ full.
8. Sprinkle extra chocolate chips on top for a bakery-style finish.
9. Bake for 20–25 minutes (jumbo muffins may need 25–30 minutes), or until a toothpick inserted in the center comes out with moist crumbs.
10. Let muffins cool in the pan for 5–10 minutes, then transfer to a wire rack to cool completely.

Servings and timing

Serves: 12 standard muffins or 6 jumbo muffins
Prep Time: 15 minutes
Bake Time: 20–25 minutes
Total Time: 40 minutes

Variations

• Use dark cocoa powder for a deeper, more intense chocolate flavor
• Add espresso powder to enhance the chocolate taste
• Stir in chopped nuts like walnuts or pecans for crunch
• Swap sour cream with Greek yogurt for a lighter version
• Mix in white chocolate or peanut butter chips for contrast
• Add a swirl of peanut butter or Nutella in the batter for extra indulgence

Storage/Reheating

Store muffins in an airtight container at room temperature for up to 3 days, or refrigerate for up to 5 days. To reheat, warm in the microwave for 10–15 seconds. These muffins freeze well—wrap individually in plastic wrap and store in freezer bags for up to 2 months. Thaw at room temperature or microwave from frozen.

FAQs

What makes Costco muffins so moist?

Their high fat and sugar content, along with ingredients like sour cream or oil, give them a super moist texture.

Can I make these muffins smaller?

Yes, use a standard muffin tin and adjust the bake time to 18–20 minutes.

Do I have to use both sugars?

Using both granulated and brown sugar adds moisture and depth of flavor, but you can substitute one for the other if needed.

Can I use buttermilk instead of milk?

Yes, buttermilk adds a slight tang and enhances the tender crumb.

Can I use a hand mixer?

It’s not necessary—this recipe comes together easily by hand. Overmixing can lead to dense muffins.

Why did my muffins sink?

Overmixing or opening the oven too early can cause muffins to collapse. Be sure to follow baking instructions closely.

What type of cocoa powder works best?

Use unsweetened natural cocoa powder for classic chocolate flavor. Dutch-processed can be used for a richer taste but may alter texture slightly.

Can I make this recipe gluten-free?

Yes, use a 1:1 gluten-free flour blend designed for baking.

Can I make this dairy-free?

Swap dairy milk with almond or oat milk, and use dairy-free yogurt or sour cream alternatives.

What can I serve with these muffins?

Serve with a glass of milk, coffee, or fresh fruit for a complete breakfast or snack.

Conclusion

Homemade Costco Double Chocolate Muffins are the perfect way to enjoy bakery-style indulgence without leaving your kitchen. With their rich chocolate flavor, moist texture, and jumbo size, these muffins are perfect for treating yourself or sharing with others. Whether served for breakfast, dessert, or packed into lunchboxes, they’re a chocolate lover’s dream come true.

Costco Double Chocolate Muffins

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These homemade Costco Double Chocolate Muffins are moist, rich, and loaded with cocoa and chocolate chips. Perfectly soft and jumbo-sized, they’re just like the bakery-style favorites—ideal for breakfast, dessert, or snack time.

• Author: Laura
• Prep Time: 15 minutes
• Cook Time: 25 minutes
• Total Time: 40 minutes
• Yield: 12 standard muffins or 6 jumbo muffins
• Category: Breakfast, Dessert
• Method: Baking
• Cuisine: American
• Diet: Vegetarian

Ingredients

• 2 cups all-purpose flour
• 3/4 cup unsweetened cocoa powder
• 1 tbsp baking powder
• 1/2 tsp baking soda
• 1/2 tsp salt
• 2 large eggs
• 3/4 cup granulated sugar
• 1/2 cup brown sugar
• 1 cup sour cream or Greek yogurt
• 1/2 cup milk
• 1/2 cup vegetable oil
• 2 tsp vanilla extract
• 1 1/2 cups chocolate chips or chunks (plus more for topping)

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Instructions

1. Preheat oven to 375°F (190°C). Line or grease a standard or jumbo muffin tin.
2. In a large bowl, whisk flour, cocoa powder, baking powder, baking soda, and salt.
3. In a separate bowl, whisk eggs, granulated sugar, and brown sugar until smooth.
4. Add sour cream, milk, oil, and vanilla. Stir until well combined.
5. Gently fold the dry ingredients into the wet ingredients until just combined—do not overmix.
6. Stir in chocolate chips, reserving some for the tops.
7. Divide batter evenly among muffin cups, filling about 3/4 full. Top with reserved chocolate chips.
8. Bake for 20–25 minutes for standard muffins or 25–30 minutes for jumbo muffins, until a toothpick inserted in the center comes out with a few moist crumbs.
9. Let cool in the pan for 5–10 minutes, then transfer to a wire rack to cool completely.

Notes

• For extra flavor, add 1 tsp espresso powder to the batter.
• Use Dutch-processed cocoa for a deeper chocolate taste.
• Muffins freeze well—wrap individually and store up to 2 months.

Nutrition

• Serving Size: 1 standard muffin
• Calories: 350
• Sugar: 26g
• Sodium: 230mg
• Fat: 18g
• Saturated Fat: 6g
• Unsaturated Fat: 10g
• Trans Fat: 0g
• Carbohydrates: 42g
• Fiber: 3g
• Protein: 5g
• Cholesterol: 45mg