Birthday Cake Macarons

Name: Birthday Cake Macarons
Prep time: 2 h
Cook time: 15 min
Total time: 2 h 15 min
Cuisine: French
Ingredients: 47 grams all purpose four; 50 grams granulated sugar; 1/8 teaspoon baking powder; 2 tablespoons unsalted butter (melted ); 1/2 teaspoon vanilla bean paste (substitute vanilla extract ); 1 tablespoon rainbow nonpareils; 100 grams egg whites (room temperature); 1/4 teaspoon cream of tartar; 60 grams granulated sugar; 1/2 teaspoon vanilla bean paste (optional ); 110 grams almond flour (sifted); 200 grams powdered sugar (sifted); rainbow nonpareils; 113 grams unsalted butter (room temperature); 180 grams powdered sugar; 1 teaspoon vanilla bean paste (substitute vanilla extract )