- HEAT oven to 400ºF.
- BROWN meat in large nonstick skillet; drain. Stir in tomatoes and oregano; cook 5 min. or until heated through, stirring occasionally. Meanwhile, prepare Dinner as directed on package, omitting the butter.
- ADD prepared Dinner to meat mixture; mix well. Spoon into 9-inch square baking dish; top with cheddar.
- BAKE 10 min. or until cheddar is melted and casserole is heated through.