Copycat Costco Double Chocolate Chip Muffins
Bakery style Copycat Costco Double Chocolate Chip Muffins with a domed top, rich cocoa crumb, and pools of melted chocolate in every bite, ready in under an hour.
The Muffin That Made Costco Famous
If you have ever pushed a cart past the Costco bakery case and caught sight of those towering, cracked top, double chocolate chip muffins, you know the pull is real. They are impossibly tall, deeply chocolatey, and studded with enough chips to make dessert for breakfast feel completely justified. This copycat recipe brings that exact bakery magic home, no membership card required.
What makes the Costco version so iconic is the sheer height of the dome and the way the crumb stays soft and almost fudgy under a slightly crackled top. We are recreating both of those signature traits here using a classic bakery trick: a hot oven start followed by a lower finishing temperature, plus a rich, oil based batter that keeps things moist for days.
Before we get cooking, the right tools and ingredients make a real difference here. A sturdy jumbo muffin tin is non negotiable for getting that signature towering shape, and good quality cocoa powder and semi-sweet chocolate chips will make the chocolate flavor taste closer to bakery grade rather than flat and one note.
Why This Recipe Tastes Like the Real Thing
A lot of homemade chocolate muffin recipes end up dry or too cakey. This one leans on buttermilk, oil, and melted butter together, which is the combination that keeps Costco bakery muffins so soft even after sitting out on the counter. The touch of hot coffee or water blooms the cocoa powder, intensifying the chocolate flavor without making the muffins taste like coffee at all.
These muffins are also intentionally sized up. Standard muffin tins will work in a pinch, but a jumbo tin gets you closer to that giant bakery scale everyone loves.
Chef's Tip: Resist the urge to open the oven door during that first 5 minute hot blast. The rush of steam and heat is exactly what forces the batter upward into a tall dome instead of spreading flat.
Getting That Bakery Style Crackled Top
The two step baking temperature is the real workhorse of this recipe. Starting at 425 degrees F gives the batter a burst of heat that sets the edges quickly while the center is still rising, which is what creates that dramatic crack across the top, just like the muffins from the Costco bakery case or even a Starbucks chocolate chip muffin. Dropping the oven to 350 degrees F afterward finishes baking the center gently so it stays moist instead of drying out.
A few things that will help your muffins turn out picture perfect:
- Fill the muffin cups almost to the very top, more than you might think looks right.
- Use room temperature eggs and buttermilk so the batter mixes evenly.
- Fold the batter gently. Overmixing chocolate muffin batter leads to a tough, dense crumb instead of a tender one.
- Press a few extra chocolate chips onto the tops right before baking for that bakery display look.
Ready to make it? Here is the full step-by-step recipe:
Copycat Costco Double Chocolate Chip Muffins
Bakery style Copycat Costco Double Chocolate Chip Muffins with a domed top, rich cocoa crumb, and pools of melted chocolate in every bite, ready in under an hour.
Ingredients
- 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 packed light brown sugar
- 2 large eggs, room temperature
- 1 cup buttermilk, room temperature
- 1/2 cup vegetable oil
- 1/4 cup unsalted butter, melted and cooled slightly
- 2 tsp vanilla extract, pure
- 2 cups semi-sweet chocolate chips, divided, plus extra for topping
- 1/2 cup hot water or coffee, brewed coffee deepens the chocolate flavor but isn't required
Instruction
Preheat your oven to 425 degrees F (220 degrees C). This high initial heat is the secret to that tall, domed Costco style top. Grease a jumbo muffin tin generously or line with jumbo paper liners.
In a large bowl, whisk together the flour, cocoa powder, baking soda, baking powder, and salt until well combined and free of lumps.
In a separate large bowl, whisk the granulated sugar, brown sugar, and eggs together until slightly thickened and glossy, about 1 minute.
Whisk the buttermilk, vegetable oil, melted butter, and vanilla extract into the sugar mixture until smooth.
Pour the wet ingredients into the dry ingredients and gently fold with a spatula until just a few streaks of flour remain. Do not overmix.
Stir in the hot water or coffee until the batter is smooth and glossy, then fold in 1.5 cups of the chocolate chips.
Divide the batter evenly among the muffin cups, filling each one almost to the top. Sprinkle the remaining chocolate chips over the tops, pressing a few in gently for that bakery look.
Bake at 425 degrees F for 5 minutes, then, without opening the oven door, lower the temperature to 350 degrees F (175 degrees C) and continue baking for 16 to 18 minutes, until a toothpick inserted in the center comes out with a few moist crumbs.
Let the muffins cool in the tin for 10 minutes, then transfer to a wire rack to cool slightly before serving warm.
Equipment
- Jumbo muffin tin
- Jumbo paper liners
- Large mixing bowls
- Whisk
- Rubber spatula
- Cooling rack
- Ice cream scoop or large cookie scoop
Notes
Serving, Storing, and Make Ahead Tips
These muffins are best enjoyed warm, about 15 minutes out of the oven, when the chocolate chips are still soft and a little melty. They also make a fantastic grab and go breakfast or afternoon treat with a glass of cold milk or a hot cup of coffee.
To store, keep cooled muffins in an airtight container at room temperature for up to 3 days. For longer storage, wrap each muffin individually and freeze for up to 3 months, then thaw at room temperature or warm briefly in the microwave whenever a craving hits.
If you love the idea of a copycat Costco bakery muffin recipe but want to switch things up later, this same base method works beautifully for a plain chocolate chip version, just swap the cocoa powder for extra flour. Either way, once you have made a batch of these at home, it is hard to go back to store bought.
