2 1/2 c. graham cracker crumbs
1 (14 oz.) can sweetened condensed milk
1 (6 oz.) pkg. chocolate chips
1 tsp. vanilla
1 c. chopped nuts or raisins

Combine all the ingredients in a bowl; mix well. Pour into a 9 x 9 inch square pan. Bake at 325 degrees for 30 minutes. Cool and cut into bars. Yield: 16 bars.