Pistachio Crinkle Cookies

INGREDIENTS
3/4 cup shelled pistachios
1 cup granulated sugar
3 Tbsp. unsalted butter, softened
2 large eggs
1 tsp. vanilla extract
1 1/2 cups all-purpose flour
1 tsp. baking powder
1/4 tsp. salt
1 drop green food coloring, if desired
1/2 cup confectioner’s sugar