1 can condensed milk
21 graham crackers, crushed (1 1/2 c.)
3 tbsp. milk
1 pkg. chocolate bits
1/4 c. chopped nuts (optional)

Mix milk and condensed milk. Add finely crushed graham crackers, chocolate bits and nuts. Spread in well greased and floured pan (10x15 inch). Bake at 350 degrees until mixture springs back when touched, about 30 minutes. Cut into desired pieces. Remove from pan while warm.