2Sprinkle cinnamon-sugar on a greased 9-inch square baking pan.
3In a large bowl,combine peanut butter,margarine and splenda sweetener.Add eggs and cinnamon;mix well.Combine flour,baking powder and sodium-free salt;
add alternately with milk to creamed mixture.Mix well.
4Pour into the pan.Bake at 350 degrees for 30-35 minutes
or until a toothpick inserted near the center comes out
clean.Cool on wire rack.
5For the frosting,combine peanut butter and margarine.Add sugar,milk and coconut extract;mix until smooth.Frost onto the cake and sprinkle cinnamon on the