Dissolve cornstarch in milk. Combine all ingredients in 2-quart microproof casserole. Cover. Cook on power level "Hi" 6 to 7 minutes, or until cabbage is tender, stirring once during cooking. Stir and let stand 2 minutes before serving.
Peel potatoes and quarter. Combine potatoes and water in 2-quart microproof casserole; cover. Cook on power level "Hi" 12-14 minutes, or until tender, stirring once during cooking; drain. Add butter, parsley, salt, and pepper. Stir until butter is melted. Serve immediately.