Copycat Costco Double Chocolate Chip Muffins
These copycat Costco double chocolate chip muffins are impossibly tall, bakery soft, and loaded with chocolate in every bite, just like the famous warehouse version.
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 chocolate muffins the size of a softball, you know the pull is real. These copycat Costco double chocolate chip muffins recreate that exact bakery magic at home: a deeply fudgy, almost brownie-like crumb, a crackly domed top, and pools of melted chocolate in every single bite. This is easily one of the most requested Costco bakery muffin recipes out there, and once you taste one warm from your own oven, you will understand why.
Unlike a lot of Starbucks chocolate chip muffins or standard bakery muffins that lean more cake-like and mild, this Costco style double chocolate chip muffin recipe goes all in on real cocoa flavor. It is rich, a little dense in the best way, and generous with chocolate chips both inside and on top. Think of it as a cross between a muffin and a brownie that decided to wear a muffin costume.
Before we get cooking, the right tools and ingredients make a real difference here. A good jumbo muffin tin is what gets you those iconic oversized bakery tops, and quality cocoa powder and real chocolate chips (not the waxy kind) are what separate an average muffin from one that actually tastes like it came from the Costco bakery case.
What Makes These Muffins So Costco-Like
The secret to that famous towering muffin top is not a trick ingredient, it is technique. Three things do the heavy lifting here:
- A jumbo muffin tin. Standard muffin tins will give you a smaller, more modest dome. Jumbo tins let the batter climb high the way bakery muffins do.
- A hot oven start. Baking at a high temperature for the first few minutes forces the batter to rise quickly before the structure sets, which is exactly how you get that cracked, domed top.
- Hot coffee in the batter. This is the same trick Sally's chocolate muffins and many great chocolate cake recipes rely on. The heat blooms the cocoa powder, deepening the chocolate flavor without making the muffins taste like coffee at all.
Chef's Tip: Don't skip filling the muffin cups all the way to the top. It might look like too much batter, but that generous fill is exactly what creates the signature Costco bakery muffin dome.
Ingredient Notes
This recipe for Costco muffins uses pantry staples with a couple of small upgrades that make a big difference.
- Cocoa powder gives the base its deep chocolate color and flavor, while the chocolate chips add pockets of gooey sweetness.
- Buttermilk keeps the crumb tender and slightly tangy, balancing all that sugar and chocolate.
- Brown sugar alongside granulated sugar adds moisture and a subtle caramel note you won't get from white sugar alone.
- Oil instead of butter is what keeps these muffins soft for days, since oil stays liquid at room temperature while butter firms up.
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 tall, bakery soft, and loaded with chocolate in every bite, just like the famous warehouse version.
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 light brown sugar, packed
- 2 large eggs, room temperature
- 1 cup buttermilk, room temperature
- 1/2 cup vegetable oil, or melted unsalted butter
- 2 tsp vanilla extract, pure, not imitation
- 1/2 cup hot coffee, or hot water, brings out the chocolate flavor
- 2 cups semisweet chocolate chips, divided, plus extra for topping
Instruction
Preheat the oven to 425 degrees F (220 degrees C). This high initial heat is the secret to the tall, domed bakery-style tops. Generously grease a jumbo 6-cup muffin tin or line with jumbo muffin liners and grease the liners too.
In a large bowl, whisk together the flour, cocoa powder, baking soda, baking powder, and salt until well combined and no cocoa lumps remain.
In a separate large bowl, whisk the granulated sugar, brown sugar, and eggs together until smooth. Whisk in the buttermilk, oil, and vanilla extract until fully combined.
Pour the wet ingredients into the dry ingredients and fold gently with a spatula until just barely combined, a few streaks of flour are fine.
Pour in the hot coffee and fold just until the batter is smooth and glossy. Do not overmix, a few lumps are okay. Fold in 1 and 1/2 cups of the chocolate chips.
Divide the batter evenly among the 6 jumbo muffin cups, filling each all the way to the top. Sprinkle the remaining chocolate chips generously over each muffin top.
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 18 to 20 minutes, until a toothpick inserted in the center comes out with a few moist crumbs.
Cool the muffins in the pan for 10 minutes, then transfer to a wire rack to cool slightly before serving warm.
Equipment
- Jumbo 6-cup muffin tin
- Jumbo muffin liners
- Large mixing bowls
- Whisk
- Rubber spatula
- Wire cooling rack
Notes
Tips For Bakery-Style Success
A few small details separate a good batch from a great one:
- Do not overmix the batter. Stir just until the flour disappears. Overmixing develops gluten and leads to tough, dense muffins instead of soft, tender ones.
- Fill the cups generously. Filling jumbo cups all the way to the top (unlike most muffin recipes) is what gives you that oversized bakery look.
- Watch the temperature drop. Starting hot and then lowering the oven temperature partway through is the real key to getting height without burning the tops.
Chef's Tip: For extra bakery flair, press a few additional chocolate chips onto each muffin top right when they come out of the oven. They will melt slightly and look absolutely stunning.
Serving and Storing
These muffins are best enjoyed the day they are baked, still slightly warm with soft, melty chocolate throughout, but they hold up beautifully for days afterward too. Keep them in an airtight container at room temperature, and give them a quick 10 to 15 second zap in the microwave before serving to refresh that fresh-baked texture.
They also freeze wonderfully, which makes this one of those Costco bakery muffins recipes worth doubling. Wrap cooled muffins individually and freeze for up to three months, then thaw at room temperature or reheat straight from frozen whenever a chocolate craving strikes.
Whether you are chasing the nostalgia of a warehouse run or just want a seriously good chocolate muffin recipe in your regular rotation, this one delivers every time.
