INGREDIENTS
3/4 cup
unsalted butter, softened
3/4 cup
granulated sugar
1
large egg
1
large egg yolk
1 tsp
vanilla extract
1/2 tsp
baking soda
1/2 tsp
cream of tartar
1/2 tsp
salt
2 cups
all-purpose flour
4 tbsp
unsalted butter, softened
1 1/3 cups
powdered sugar
1 tsp
vanilla extract
1/8 tsp
salt
1 tbsp
milk
Food coloring, if desired
Sprinkles, optional