Festive Freezer Coffee Cake
["2/3 c. packed brown sugar", "1/2 c. chopped walnuts", "1 tsp. cinnamon", "2 Tbsp. butter or margarine", "1 large Golden Delicious apple, chopped", "1/4 c. maraschino cherries, chopped", "3/4 c. sugar", "2 large eggs", "1 c. sour cream", "1 tsp. vanilla", "2 c. plain flour", "1 tsp. baking powder", "1 tsp. baking soda", "1/2 tsp. salt", "1/2 c. margarine"]
["Grease a 9 x 9-inch metal pan.", "Prepare topping:", "Mix brown sugar, walnuts, cinnamon and 2 tablespoons butter or margarine; set aside."]
["brown sugar", "walnuts", "cinnamon", "butter", "Golden Delicious apple", "maraschino cherries", "sugar", "eggs", "sour cream", "vanilla", "flour", "baking powder", "baking soda", "salt", "margarine"]