Coconut Sour Cream Layer Cake
["1 pkg. (18 1/2 oz.) butter-flavored cake mix", "2 c. sugar", "1 (16 oz.) carton sour cream", "1 (12 oz.) pkg. frozen coconut, thawed", "1 1/2 c. frozen whipped topping, thawed (9 oz. Cool Whip)"]
["Prepare cake mix according to directions on package, making 2 (8-inch) layers.", "When completely cooled, split both layers. Combine sugar, sour cream and coconut; blending well; chill. Reserve 1 cup sour cream mixture for frosting.", "Spread remainder between layers.", "Combine reserved sour cream mixture with whipped topping; blend until smooth.", "Spread on top and sides.", "Seal cake in airtight container and refrigerate for 3 days before serving. Keep refrigerated."]
["butter", "sugar", "sour cream", "frozen coconut", "frozen whipped topping"]