Preheat the oven to 350°F. Line the cupcake pan with cupcake liners. Mix the cake mix, egg whites, buttermilk, oil, and almond extract until combined. Stir in sprinkles gently. Bake 16–18 minutes and let cool.
To make the frosting, beat the butter until creamy. Add in the powdered sugar gradually, then vanilla, almond extract, and heavy cream until light and pipeable.
Frost the cupcakes by using a knife and spreading the buttercream or piping it with a piping bag fitted with a piping tip. Add more sprinkles and any extra decorations.