Heat oven to 350 degrees. Grease and flour 8 x 8 x 2 inch square pan.

In small mixing bowl combine:

1 2/3 c. all-purpose flour
1 c. packed light brown sugar
1/4 c. Hershey's cocoa
1 tsp. baking soda
1/4 tsp. salt

Add and beat until smooth:

1 c. water
1/3 c. vegetable oil
1 tsp. vinegar
3/4 tsp. vanilla

Pour into prepared pan. Sprinkle 1/2 cup Hershey's semi-sweet chocolate chips over top. Bake 35 to 40 minutes or until wooden pick inserted in center comes out clean. Cool in pan on wire rack. Cut into squares.

VARIATION: Chocolate Banana Snack Cake - Decrease water to 1/2 cup, stir in 1/2 cup mashed, ripe bananas before pouring batter into pan.