BASE:

1 c. flour
1/4 c. sugar
1/2 c. butter

FILLING:

1 c. (13 squares) graham cracker crumbs
1/2 c. chocolate chips
1/2 c. chopped nuts
1 tsp. baking powder
1/4 tsp. salt
1 (14 oz.) can sweetened condensed milk
1 tsp. vanilla

FROSTING:

1 1/2 c. powdered sugar
1/2 c. butter
1 tsp. vanilla

Combine flour and sugar. Cut in 1/2 cup butter until crumbly. Press into ungreased 9"x13" pan. Bake at 350 degrees for 10 minutes. Cool. Combine all filling ingredients. Mix well. Spread over partially baked base. Return to oven and bake 15 to 20 minutes. Cool completely. Blend all frosting ingredients until smooth. Frost when cooled and cut. Makes 36 bars.