WHISK together 1/3 cup Miracle Whip Calorie-Wise Dressing, 2 Tbsp flour and 1 cup milk until smooth. Cook in microwave on HIGH for 2 to 3 min (stirring once during cooking) until sauce is thickened.

STIR in 1 cup Kraft Double Cheddar Shredded Cheese and place 1/2 cup sauce on bottom of a lightly greased 13 x 9 in. baking dish.

LAYER 3 cups sliced, cooked potatoes and sweet potatoes in dish with 1 thinly sliced onion and finish with the remaining sauce. Cover and bake at 350°F for 30 min, removing cover for the last 10 minutes to brown.