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Perfect Small-Batch Birthday Cake Cupcakes with Best Sprinkle Buttercream

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These small-batch birthday cake cupcakes make exactly six tender, fluffy cupcakes topped with a colorful sprinkle buttercream. Perfect for last-minute celebrations, quiet nights, or when you want a taste of something sweet without a mountain of leftovers.

Ingredients

Scale
  • ¾ cup cake flour (not all-purpose—cake flour makes a huge difference in tenderness; I prefer Swan’s Down or Softasilk)
  • ½ cup granulated sugar
  • 1 teaspoon baking powder
  • ¼ teaspoon salt
  • ¼ cup unsalted butter, softened to room temperature (use a good quality butter like Kerrygold for best flavor)
  • 1 large egg, room temperature (crucial for proper emulsification)
  • ¼ cup whole milk, room temperature (you can use 2% but avoid skim)
  • 2 tablespoons sour cream, room temperature (adds moisture and tenderness)
  • 1½ teaspoons vanilla extract (pure, not imitation, if possible)
  • ¼ cup rainbow sprinkles (jimmies style, not nonpareils, to prevent color bleeding)
  • ½ cup unsalted butter, softened to room temperature (for buttercream)
  • 1½ cups powdered sugar, sifted (for buttercream)
  • 1 tablespoon whole milk (or heavy cream for extra richness) (for buttercream)
  • ½ teaspoon vanilla extract (for buttercream)
  • Pinch of salt (for buttercream)
  • 3 tablespoons rainbow sprinkles (jimmies style), gently folded in at the end (for buttercream)

Instructions

  1. Preheat your oven to 350°F (175°C). Line 6 cups of a standard muffin pan with paper liners. Fill the empty cups about halfway with water—this prevents the pan from warping and helps the cupcakes bake evenly.
  2. Whisk the dry ingredients together. In a medium bowl, whisk together the cake flour, sugar, baking powder, and salt until well combined. Make sure there are no lumps of baking powder hiding in there. Set aside.
  3. Mix the wet ingredients. In a small bowl, whisk together the softened butter, egg, milk, sour cream, and vanilla extract. It will look a little separated and lumpy—that is totally normal. Do not overmix here.
  4. Combine wet and dry. Pour the wet mixture into the dry mixture and stir gently with a rubber spatula until just combined. You want to see a few streaks of flour still visible. Overmixing at this stage will make the cupcakes tough, so stop as soon as the flour disappears.
  5. Fold in the sprinkles. Add the ¼ cup of rainbow sprinkles and fold them in with 3-4 gentle strokes. Do not stir vigorously or the colors will start to bleed.
  6. Fill the liners. Divide the batter evenly among the 6 lined cups. Each liner should be about ⅔ full. I use a cookie scoop for even portions, but you can eyeball it. The batter will be thick and fluffy.
  7. Bake for 15-18 minutes. Bake at 350°F (175°C) until the tops are golden and a toothpick inserted into the center comes out clean or with a few moist crumbs. Mine are usually perfect at 16 minutes. Let them cool in the pan for 5 minutes, then transfer to a cooling rack to cool completely.
  8. Make the buttercream while the cupcakes cool. In a medium bowl, beat the softened butter with an electric mixer on medium speed until smooth and creamy, about 2 minutes. Add the sifted powdered sugar, milk, vanilla extract, and a pinch of salt. Start on low speed to avoid a sugar cloud, then increase to medium-high and beat for 3-4 minutes until light and fluffy. Scrape down the bowl halfway through.
  9. Fold in the sprinkles for the frosting. Using a rubber spatula, gently fold the 3 tablespoons of rainbow sprinkles into the buttercream. Fold just until distributed—overmixing will turn the frosting a muddy pinkish-gray color.
  10. Frost the cooled cupcakes. Once the cupcakes are completely cool, pipe or spread the buttercream on top. I use a Wilton 1M star tip for that classic bakery swirl, but a knife works just fine. Top with extra sprinkles if you are feeling festive.

Notes

Room temperature ingredients matter—let butter, egg, milk, and sour cream sit out for about 30 minutes before starting. Do not overmix the batter; mix only until flour disappears. Use a cookie scoop for even batter distribution. Watch baking time closely; start checking at 14 minutes. Let buttercream beat long enough—beat butter alone first for 2 minutes, then add sugar and beat for another 3-4 minutes. If in a hurry, cool cupcakes in the fridge for 10 minutes after they come to room temperature, but do not frost while warm.

Nutrition

Keywords: small-batch cupcakes, birthday cake cupcakes, sprinkle buttercream, easy cupcake recipe, homemade cupcakes, vanilla cupcakes, rainbow sprinkle cupcakes

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