1 1/2 cups graham cracker crumbs
1/2 cup cocoa, divided
1/4 cup sugar
1/2 cup butter
1 can (14 oz) sweetened condensed milk
1/4 cup all-purpose flour
1 tsp vanilla extract
1/2 tsp baking powder
3/4 cup chopped nuts
2 cups (12 oz pkg) semi-sweet chocolate chips
Preheat oven to 350 degrees.
In a medium bowl, stir graham cracker crumbs, 1/4 cup of the cocoa and the sugar together. Stir butter into mixture, blending well. Press mixture firmly onto bottom of ungreased 13 x 9 x 2-inch baking pan.
In a small bowl, beat sweetened condensed milk, flour, egg, vanilla, baking powder and the remaining cocoa. Stir nuts into the mixture. Spread evenly over prepared crust. Sprinkle with chocolate chips. Bake in 350 degree oven for 25 minutes or until set. Cool completely in the pan on a wire rack. Cut into 24 or 36 bars depending on the size you want. Store in a tightly covered container at room temperature.