1 pkg. Duncan Hines moist deluxe strawberry supreme cake
2/3 c. strawberry jam, divided
2 1/2 c. fresh blueberries, divided
1 (8 oz.) container frozen whipped topping, divided
Fresh strawberries for garnish

Preheat oven to 350 degrees. Grease and flour 2 (9 inch) round cake pans. Prepare, bake, and cool cake according to directions on the package. Place 1 cake layer on serving plate. Spread with 1/3 cup strawberry jam. Arrange 1 cup blueberries on jam. Spread half the whipped topping to within 1/2 inch of cake edge. Place second cake layer on top. Repeat using remaining strawberries, 1 cup blueberries, and Cool Whip. Garnish with strawberries and remaining blueberries. Refrigerate until ready to serve. Makes 12 servings.