Heat oven to 350°F
.Mix pasta sauce and milk until blended
.Reserve 3/4 cup cheese for later use. Combine remaining cheese with all remaining ingredients in large bowl. Add pasta sauce mixture; mix lightly
.Spoon into 13x9-inch baking dish sprayed with cooking spray; cover.
Bake 20 min. Stir tortellini mixture. Top with reserved cheese; bake 5 min. or until melted