01 -
1 stick of butter, softened.
02 -
1 and a half cups of powdered sugar.
03 -
1 room-temperature large egg.
04 -
2 tsp of vanilla extract.
05 -
Three cups of plain flour.
06 -
1 tsp baking powder.
07 -
A pinch of kosher salt (about 1/4 teaspoon).
08 -
Up to 2 tsp water, only if needed.
09 -
2 and a half cups powdered sugar (for the icing).
10 -
About 1 and a quarter tbsp meringue powder.
11 -
3 to 4 tbsp lukewarm water.
12 -
A quarter to 1 tsp of clear vanilla flavoring.
13 -
Red, green, and blue gel food colors.