Ingredients
Equipment
Method
- Preheat oven to 350°F (177°C) and line a 12-count muffin pan with liners.
- Whisk flour, baking powder, baking soda, and salt together in a bowl.
- In a separate bowl, mix melted butter and sugar. Whisk in the egg, sour cream, milk, and vanilla until smooth.
- Combine wet and dry ingredients gently until just mixed. Do not overmix.
- Divide batter into liners and bake for 18-21 minutes. Let cool completely.
- Beat softened butter for the frosting until smooth. Gradually add sifted powdered sugar, beating until incorporated.
- Add heavy cream, vanilla, and salt to the frosting, beating on high for 2 minutes until fluffy.
- Divide frosting into three bowls. Tint one blue, one yellow, and one green using gel coloring.
- Swipe lines of each color side-by-side on plastic wrap, roll into a log, snip the end, and place into a piping bag fitted with a Wilton 2D or 1M tip.
- Hold the bag vertically over the cooled cupcake and pipe small, clustered star shapes, building them up into a dome to resemble a hydrangea flower.
Notes
Ensure cupcakes are completely cool before frosting. If your hands make the buttercream too warm while piping, chill the bag in the fridge for 5 minutes.