Quick Cocoa Brownie Wedges
["1/2 c. butter or margarine", "1/3 c. cocoa", "1 c. sugar", "2 eggs", "1 tsp. vanilla extract", "1 c. all-purpose flour", "1/4 tsp. baking powder", "1/8 tsp. salt", "powdered sugar"]
["Line an 8 1/4-inch round microwave-safe cake dish with plastic wrap; set aside."]
["butter", "cocoa", "sugar", "eggs", "vanilla extract", "flour", "baking powder", "salt", "powdered sugar"]