Heath Bar Coffee Cake
["1 c. brown sugar", "1/2 c. white sugar", "2 c. flour", "1 stick margarine (1/2 c.)", "1 egg", "1 tsp. vanilla", "1 c. buttermilk", "1 tsp. baking soda", "1/2 tsp. salt"]
["Mix brown sugar, white sugar, flour and margarine together until crumbly.", "Reserve 1/2 cup and set aside.", "Add egg, vanilla, 1 cup buttermilk (with 1 teaspoon baking soda mixed with buttermilk) and 1/2 teaspoon salt.", "Pour into greased 9 x 13-inch pan or dish."]
["brown sugar", "white sugar", "flour", "margarine", "egg", "vanilla", "buttermilk", "baking soda", "salt"]