At the 16-minute mark, these muffins look like little chocolate cakes, but the tops aren’t finished yet. That’s when the mini marshmallows go on, so they get just enough oven time to soften and turn the muffin into a hot-chocolate-inspired treat without disappearing into the batter. I like that the chocolate flavor comes from both cocoa powder and semisweet chips: the crumb tastes rich, and you still get pockets of melted chocolate.
The batter comes together in two bowls, and the best thing you can do for its texture is stop stirring as soon as the dry flour disappears. A few small lumps are fine; a smooth, heavily worked batter isn’t the goal. Once it’s portioned into a standard muffin pan, the oven handles the rest. The finished muffins have a tender cocoa crumb, warm chocolate chips, and soft marshmallows on top.
Kitchen Note
I set out the mini marshmallows before the pan goes into the oven. When the first bake is done, I can top each muffin quickly and evenly instead of counting marshmallows while the oven door is open.
Save these Hot Chocolate Muffins for a bake with cocoa-rich centers, chocolate chips, and soft marshmallow tops.
Why a Few Lumps Make Better Cocoa Muffins
Once the wet ingredients meet the flour, cocoa, and leaveners, extra stirring works the flour’s gluten. That can leave muffins with a firmer, chewier crumb instead of the soft texture you want here. Stir only until you can’t see dry flour, then fold in the chocolate chips. The batter doesn’t need to look perfectly smooth, and chasing every lump is more likely to hurt the texture than help it.
The balance of baking powder and baking soda helps these muffins rise, while buttermilk brings moisture and a slight tang to the cocoa batter. That combination gives you a tender muffin with a clear chocolate taste, not a dense, brownie-like center. Keep the two-bowl method simple: whisk the dry ingredients together first, combine the wet ingredients separately, and bring them together with a light hand. There’s no need for an electric mixer or a long beating session.
What Each Ingredient Brings to These Hot Chocolate Muffins
- Unsweetened cocoa powder — This provides the muffins’ deep cocoa flavor without making the batter sweeter. Use a cocoa powder you enjoy drinking or baking with; cocoa is the main flavor, so a stale or flat-smelling tin will show. Keep it unsweetened so the sugar balance stays where it should.
- Buttermilk — Its tang keeps the chocolate from tasting one-note, and its acidity works alongside the baking soda. If you don’t have buttermilk, the dairy-free card below gives a workable alternative; plain milk on its own won’t bring the same acidity.
- Neutral oil — Canola or vegetable oil keeps the crumb soft and lets the cocoa and chocolate stand out. Either is a sensible, inexpensive choice; strongly flavored oils would compete with the chocolate.
- Semisweet chocolate chips — They stay in distinct chocolate pockets instead of blending completely into the batter. Semisweet keeps the muffin from becoming overly sweet; choose chips you like eating straight from the bag.
- Mini marshmallows — Their small size makes them easy to distribute across the muffin tops and soften during the short final bake. Regular-size marshmallows don’t give the same even topping without extra cutting.
- Eggs — They help hold the muffin crumb together and add richness. Use large eggs for the right balance with the flour and buttermilk.
Mixing and Baking Without Tough Muffins or Scorched Marshmallows
Whisk the dry ingredients evenly
Heat the oven to 375°F and line a standard 12-cup muffin pan with paper liners. Whisk the flour, cocoa powder, sugar, baking powder, baking soda, and salt in a large bowl until the cocoa is distributed and you don’t see pockets of leavener. Cocoa tends to cling in small clumps, so break those up with the whisk. An even mix here means you won’t need to stir the finished batter excessively later.
Combine the wet ingredients separately
In a medium bowl, whisk the eggs, buttermilk, oil, and vanilla until they’re combined. Pour that mixture into the dry ingredients and stir only until no dry flour remains. Fold in the chocolate chips with a few strokes. If the batter still has small lumps, leave them; a perfectly smooth batter is not worth overmixing.
Fill the cups and bake the first round
Divide the batter evenly among the lined muffin cups so they bake at a similar rate. Bake for 16 minutes before adding the marshmallows. The muffins are not finished yet at this stage; the second bake sets the centers and softens the topping. Keep the marshmallows ready to go so you can add them as soon as the first bake is complete.
Top, finish, and cool
Put three mini marshmallows on each muffin, then return the pan to the oven for 2–4 minutes. The muffins are ready when they spring back lightly and a toothpick inserted into the cake comes out with a few moist crumbs. A completely clean toothpick can mean you’ve baked away more moisture than you need to. Cool the muffins in the pan for 5 minutes, then move them to a wire rack.
Three Useful Ways to Adapt These Chocolate Muffins
Use bittersweet chips for a less-sweet muffin
Replace the semisweet chips with the same amount of bittersweet or dark chocolate chips. You’ll get sharper chocolate flavor and less sweetness in each bite, while keeping the same batter and method.
Make them gluten-free with a cup-for-cup blend
Replace the all-purpose flour with a measure-for-measure gluten-free baking blend intended for cakes and muffins. Choose one that includes xanthan gum or a similar binder. The crumb may be a little more delicate, so let the muffins sit in the pan for the full cooling time before transferring them.
Make a dairy-free version
For the buttermilk, measure 1 tablespoon lemon juice into a cup measure, add unsweetened soy milk to the 1-cup line, stir, and let it stand for 5 minutes before using. Choose dairy-free chocolate chips and marshmallows as well. The muffins still contain eggs, so this adaptation is dairy-free, not vegan.
Storage and Reheating
- Refrigerator: Store cooled muffins in an airtight container for up to 5 days. The crumb firms up in the refrigerator, so room temperature is better if you’ll eat them within 2 days.
- Freezer: Freeze fully cooled muffins individually wrapped, then place them in a freezer-safe container for up to 2 months. The marshmallow tops may be a little chewier after thawing.
- Reheating: Warm one muffin in the microwave for about 10 seconds, then add a few seconds if needed. Long bursts can make the marshmallow sticky and the muffin hot in spots.
Questions That Come Up When Baking Hot Chocolate Muffins
Hot Chocolate Muffins
Ingredients
Equipment
Method
- Heat the oven to 375°F.
- Line a standard 12-cup muffin pan with paper liners.
- In a large bowl, whisk together the flour, cocoa powder, sugar, baking powder, baking soda, and salt.
- In a medium bowl, whisk the eggs, buttermilk, oil, and vanilla until combined.
- Pour the egg mixture into the flour mixture and stir just until no dry flour remains.
- Fold in the chocolate chips.
- Divide the batter evenly among the muffin cups.
- Bake for 16 minutes.
- Place 3 mini marshmallows on each muffin.
- Bake for 2–4 minutes more, until the muffins spring back lightly and a toothpick inserted into the cake comes out with a few moist crumbs.
- Cool the muffins in the pan for 5 minutes.
- Transfer the muffins to a wire rack.