Chocolate Peanut Butter Cup Cookies

I just cannot get enough of the peanut butter and chocolate combination! These chocolatey, brownie-like cookies were a hit at the potluck I brought them to. (I didn't want to share!) The rich chocolate flavor was just right for the peanut butter cups, and even though they were cakey, they were not dry. The cookies hold their shape while baking, so I recommend pressing down on the tops slightly for a more flat cookie.  

Ingredients  
1/2 cup butter, cold
1/2 cup sugar
1 egg
1 1/2 cups flour
1/8 teaspoon salt
1/8 teaspoon baking powder
1/3 cup cocoa powder
1 1/2 cups mini peanut butter cups

Instructions
Preheat the oven to 375 degrees
Beat the cold butter until it is creamy. Add the sugar and continue to beat until it is mixed in. Gradually add the egg and vanilla.
In a separate bowl, mix the flour, cocoa, salt, and baking powder. Gradually add the flour mixture until just mixed in. Stir in the peanut butter cups.
Spoon tablespoons of dough onto cookie sheets. Bake for 12-15 minutes.
Yields 18 cookies