HEAT oven to 400°F. Prepare Dinner in large saucepan as directed on package. Stir in ham, peas and milk. SPOON into 9-inch square baking dish; top with Cheddar. BAKE 15 min. or until heated through. Serving Suggestion:Serve with a mixed green salad tossed with your favorite KRAFT Dressing Special Extra:Mix 1/2 cup crushed RITZ Crackers with 1 Tbsp. melted butter; sprinkle over casserole before baking. NUTRITION INFORMATION PER SERVING:450 calories, 16g total fat, 9g saturated fat, 65mg cholesterol, 1470mg sodium, 52g carbohydrate, 3g dietary fiber, 8g sugars, 25g protein, 15%DV vitamin A, 10%DV vitamin C, 30%DV calcium, 20%DV iron.