Double Chocolate Snack Cake
["1 2/3 c. flour", "1 c. packed light brown sugar", "1/4 c. Hershey's cocoa", "1 tsp. baking soda", "1/4 tsp. salt", "1 c. water", "1/3 c. vegetable oil", "1 tsp. vinegar", "3/4 tsp. vanilla extract", "1/2 c. Hershey's semi-sweet chocolate pieces"]
["Heat oven to 350\u00b0.", "Grease and flour a square pan (8 x 8 x 2-inch).", "In small mixing bowl, combine flour, sugar, cocoa, baking soda and salt.", "Add water, oil, vinegar and vanilla; beat until smooth.", "Pour into prepared pan.", "Sprinkle 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.", "Serves 6 to 8."]
["flour", "brown sugar", "cocoa", "baking soda", "salt", "water", "vegetable oil", "vinegar", "vanilla extract", "chocolate"]