Double Chocolate Snack Cake
["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", "1 c. water", "1/3 c. vegetable oil", "3/4 tsp. vanilla", "1 tsp. vinegar", "1/2 c. semi-sweet chocolate chips (miniatures are best)"]
["Heat oven to 350\u00b0.", "Grease and flour 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."]
["all-purpose", "brown sugar", "cocoa", "baking soda", "salt", "water", "vegetable oil", "vanilla", "vinegar", "semi-sweet chocolate chips"]