3/4 c. packed brown sugar
1/3 c. butter, softened
3/4 tbsp. vanilla
1 egg yolk
2 c. Bisquick baking mix
1 (5.75 oz.) pkg. milk chocolate chips
1/2 c. chopped peanuts

Heat oven to 350 degrees; mix brown sugar, butter, vanilla, and egg yolk with fork in ungreased rectangular pan, 13 x 9 x 2 inch. Stir in baking mix until moistened, mixture will be crumbly. Press evenly in pan. Bake until light brown, 16 to 18 minutes. Immediately sprinkle chocolate chips over. Let stand until chocolate chips are softened, 3 to 4 minutes; spread evenly. Sprinkle with peanuts. Cut into bars, about 2 1/2 inches. 32 bars.