Chocolate Blueberry Cookies

1 3/4 cups all-purpose flour
1/3 cup unsweetened cocoa powder
1/2 tsp baking powder
½ tsp salt
1 cup (2 sticks) butter, softened
1 cup granulated sugar
1/2 cup packed brown sugar
1 egg
1 tsp vanilla
2 cups blueberries
Additional granulated sugar

1. Preheat oven to 350-F.

2. Combine flour, cocoa, baking powder and salt in small bowl; set aside. Beat butter, 1 cup granulated sugar and brown sugar in large bowl with electric mixer at medium speed until light and fluffy. Beat in egg and vanilla until well blended.

3. Gradually beat in flour mixture on low speed until blended. Stir in blueberries

4. Drop dough by level 1/4 cupfuls onto ungreased cookie sheets, spacing 3 inches apart. Flatten dough until 2 inches in diameter with bottom of glass that has been dipped in additional granulated sugar.

5. Bake 11 to 12 minutes or until cookies are set. Cool cookies 2 minutes on cookie sheets; transfer to wire racks. Cool completely.