Peanut Butter Surprise Cake
["10 regular size Reese's peanut butter cups", "1/2 c. creamy peanut butter", "1/3 c. butter, softened", "3/4 c. sugar", "3/4 c. brown sugar, firmly packed", "2 eggs", "2 c. all-purpose flour", "2 tsp. baking powder", "1/2 tsp. salt", "3/4 c. milk", "1/4 c. peanuts, chopped and roasted (optional)"]
["Coarsely chop the peanut butter cups into random pieces; spread in a metal pan and freeze solid. Heat oven to 350\u00b0. Grease and flour a 9", "x 13-inch pan."]
["regular", "peanut butter", "butter", "sugar", "brown sugar", "eggs", "flour", "baking powder", "salt", "milk", "peanuts"]