In a skillet over medium-high heat, brown ground meat, breaking up as it cooks; drain; stir spaghetti sauce into meat.
Spread a small amount of meat mixture in the bottom of a greased 13" X 9" X 2" baking pan.
Layer 1/2 of the raviolis evenly in the bottom of the pan; sprinkle 1/2 of the remaining sauce over the raviolis; sprinkle 1/2 of the cheese over the sauce.
Repeat layering once with remaining ingredients.
Bake in a 350 degree oven for 30 minutes.