Copycat Costco Double Chocolate Chip Muffins

The Muffin That Made Costco Bakery Famous

If you have ever wandered past the Costco bakery case and caught sight of those enormous, cracked, chocolate loaded muffins, you know the pull is real. This copycat Costco double chocolate chip muffins recipe brings that same warehouse sized, bakery style muffin right into your home kitchen, minus the membership card and the mile long line. We are talking a deeply moist, fudgy chocolate crumb, a tall domed top, and pools of melted chocolate chips in every single bite.

This recipe channels the same techniques bakers like Sally use to get that coveted bakery rise, things like a hot starting oven temperature and a touch of coffee to intensify the cocoa. The result tastes like something between a chocolate muffin and a decadent chocolate cake, and honestly, it might be even better than the Costco bakery muffins recipe you have been dreaming about.

Before we get cooking, the right tools and ingredients make a real difference here. A sturdy jumbo muffin tin helps you recreate that oversized Costco bakery style muffin shape, good quality cocoa powder gives you a richer chocolate flavor, and a reliable kitchen scale takes the guesswork out of measuring flour precisely. These are the products that genuinely help this recipe shine:

Why This Recipe Works Like the Real Thing

Getting that iconic Costco bakery muffin look and texture is not about luck, it is about a few key techniques.

• A hot oven start. Baking at 425 degrees F for the first few minutes forces the batter to rise quickly, creating that tall, cracked dome before the crumb has a chance to set.
• Hot coffee in the batter. It sounds unusual, but hot coffee dissolves the cocoa powder more thoroughly and amplifies the chocolate flavor without making the muffins taste like coffee at all.
• Buttermilk and oil. Together they create an ultra moist, tender crumb that stays soft for days, much like the texture found in Costco style double chocolate chip muffins.

Chef's Tip: Fill your muffin cups almost all the way to the top. These are meant to be oversized, bakery style muffins, not delicate little cupcakes, so do not be shy with the batter.

A Simple, No Fuss Mixing Method

Unlike fussy layer cakes, this chocolate muffin recipe comes together with just two bowls and a whisk. You will mix your dry ingredients in one bowl and your wet ingredients in another, then gently fold them together. The key here is to fold just until the flour disappears. Overmixing muffin batter develops too much gluten, which leads to tough, dense muffins instead of that soft, pillowy Costco bakery style crumb everyone loves.

Once the batter comes together, you will fold in a generous amount of chocolate chips and chunks, then top each muffin with even more chocolate before baking. Yes, it is a lot of chocolate. That is the whole point.

Ready to make it? Here is the full step-by-step recipe:

Copycat Costco Double Chocolate Chip Muffins

These copycat Costco double chocolate chip muffins are impossibly moist, bakery domed, and loaded with chocolate in every bite, just like the bulk warehouse favorite you love.

Prep:20 mins

Cook:25 mins

Total:45 mins

Yield:12 servings

Cuisine:American

Yield: 12 servingsCalories: 480Protein: 7g

Carbs: 62gFat: 24gSat. Fat: 13gFiber: 3gSugar: 40gSodium: 320mg

Ingredients

Units

USM

Scale

1x2x3x

• 2 1/2 cups all-purpose flour, spooned and leveled
• 3/4 cup unsweetened cocoa powder, natural or Dutch process
• 1 tsp baking soda
• 1/2 tsp baking powder
• 3/4 tsp salt, fine sea salt
• 1 cup granulated sugar
• 1/2 cup light brown sugar, packed
• 2 large eggs, room temperature
• 1 cup buttermilk, room temperature
• 1/2 cup vegetable oil
• 4 tbsp unsalted butter, melted and cooled slightly
• 2 tsp vanilla extract, pure
• 1/2 cup hot coffee, or hot water, deepens chocolate flavor
• 1 1/2 cups semisweet chocolate chips, divided, plus extra for topping
• 1 cup milk chocolate chunks, roughly chopped if using a bar

Instruction

1

Preheat the oven to 425 degrees F (220 degrees C). This high initial heat is the secret to those tall, domed bakery style tops. Line a jumbo 6-cup muffin tin with paper liners, or use two standard 12-cup tins and only fill half of each, spacing filled cups apart for airflow.

2

In a large bowl, whisk together the flour, cocoa powder, baking soda, baking powder, and salt until well combined and no cocoa lumps remain.

3

In a separate large bowl, whisk the granulated sugar and brown sugar with the eggs until light and slightly thickened, about 1 minute.

4

Whisk in the buttermilk, vegetable oil, melted butter, and vanilla extract until smooth.

5

Pour the wet ingredients into the dry ingredients and fold gently with a spatula until just a few streaks of flour remain. Do not overmix.

6

Pour in the hot coffee and fold just until the batter is smooth and glossy. The batter will be quite thin, that is exactly right.

7

Fold in 1 cup of the semisweet chocolate chips and the milk chocolate chunks, reserving the rest for topping.

8

Divide the batter evenly among the muffin cups, filling them almost all the way to the top. This recipe makes big, generous bakery style muffins.

9

Sprinkle the reserved chocolate chips generously over the top of each muffin, pressing a few in gently so they stick.

10

Bake at 425 degrees F for 5 minutes, then, without opening the oven door, reduce the temperature to 350 degrees F (175 degrees C) and continue baking for 15 to 18 minutes, until a toothpick inserted in the center comes out with a few moist crumbs.

11

Let the muffins cool in the pan for 10 minutes, then transfer to a wire rack to cool slightly before serving warm.

Equipment

• Jumbo or standard muffin tin
• Paper muffin liners
• Large mixing bowls
• Whisk
• Rubber spatula
• Wire cooling rack
• Ice cream scoop or large spoon for portioning batter

Notes

For the tallest bakery style domes, make sure your oven is fully preheated before the muffins go in, and resist opening the door during the first 5 minutes of baking. Store cooled muffins in an airtight container at room temperature for up to 3 days, or freeze for up to 3 months. Warm frozen muffins in the microwave for 20 to 30 seconds before serving.

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Serving and Storing Your Muffins

These muffins are best enjoyed slightly warm, when the chocolate chips are still a little melty. They pair beautifully with a cold glass of milk or a hot cup of coffee, similar to the vibe you get from a chocolate chip muffin at Starbucks, but bigger and even more chocolatey.

To keep muffins fresh, store them in an airtight container at room temperature for up to three days. If you want to stock your freezer for busy mornings, wrap each muffin individually in plastic wrap, then place them in a freezer bag. They will keep well for up to three months and reheat in under a minute in the microwave.

A Few Easy Variations

• Swap half the chocolate chips for chopped walnuts or pecans for a bit of crunch.
• Use dark chocolate chips instead of semisweet for a more intense, bittersweet flavor.
• Add a teaspoon of espresso powder along with the hot coffee for an even deeper mocha note.

However you make them, this recipe for Costco muffins delivers that same nostalgic, oversized bakery magic, made fresh in your own kitchen whenever the craving strikes.