Peanut Butter Sandies

These truly melt in your mouth. You can substitute almond, pistachio or cashew butter and the corresponding nut for the peanut butter and chopped peanuts.

2 cups all-purpose flour
1 teaspoon baking powder
1/2 teaspoon baking soda
1/4 teaspoon salt
7/8 cup (1 3/4 sticks) unsalted butter, softened
1/2 cup creamy peanut butter
1 cup confectioners