Ingredients
Equipment
Method
Make the cupcake batter
- Whisk together all-purpose flour, baking powder, and salt in a mixing bowl until evenly combined. The mixture should look uniform with no visible streaks of baking powder.
- In a stand mixer, beat softened butter with granulated sugar until light and fluffy, scraping the bowl as needed. You should see the mixture turn paler and more aerated.
- Add the eggs one at a time, beating well after each addition. The batter should look smooth and glossy after both eggs.
- Alternate adding the flour mixture and sour cream to the mixer, beginning and ending with flour. Mix just until the last flour is absorbed and no dry pockets remain.
- Add vanilla extract and whole milk, then mix until the batter is cohesive. The batter should fall off a spoon in thick ribbons.
Bake and cool
- Fill cupcake liners with batter, distributing evenly across the muffin tin. Stop when cups are about two-thirds full for even domes.
- Bake at 350°F for 18 minutes, until a toothpick comes out clean. The tops should spring back lightly when touched.
- Cool the cupcakes completely on a rack. Wait until fully room temperature so frosting won’t melt.
Frost, coat, and finish
- Beat softened butter with powdered sugar until fluffy in a stand mixer. The frosting should look thick, smooth, and hold soft peaks.
- Mix cinnamon with granulated sugar in a small bowl for the coating. The blend should look evenly speckled throughout.
- Pipe frosting onto the cooled cupcakes, then roll the frosted top in the cinnamon sugar. You should see the coating adhere in a crisp, even layer.
- Top each cupcake with a small churro stick or churro piece. Press gently so it sits upright without crushing the frosting.
- Drizzle melted dark chocolate over the cupcakes if desired. Finish when the drizzle looks glossy and lightly set.
- Serve immediately after the chocolate drizzle sets. The frosting coating should stay textured rather than sticky.
Notes
For the cleanest cinnamon-sugar coating, make sure cupcakes are fully cooled before frosting. Store cupcakes in an airtight container in the refrigerator for up to 3 days; bring to room temperature before serving for best texture. Freezing is not recommended because the churro topping and frosting coating can soften after thawing. For a lighter option, use low-fat sour cream and replace half the butter in frosting with light butter spread, keeping the powdered sugar amounts the same.
