1 1/4 c. butter
3 1/2 c. powdered sugar
2 c. Oreo cookie crumbs
1 1/2 c. semi-sweet chocolate chips
1/2 c. cocoa
1 egg, beaten
1 tsp. vanilla
1/2 c. Kahlua

Combine 1/2 cup butter and cocoa in pan. Stir. Remove from heat. Add 1/2 cup powdered sugar, egg and vanilla. Stir in Oreo crumbs and mix. Press into 8 x 8 inch pan. Melt 1/2 cup butter. Combine with 1/2 cup Kahlua. Mix at low speed. Add remaining sugar and mix well. Spread over chocolate layer and chill for one hour. Combine 1/4 cup butter and 1 1/2 cups chocolate chips. Melt in saucepan until smooth. Spread over mixture and chill several hours.