In the base of a large slow cooker, place one pound of ground beef. Break it up with a spoon. Add the mixed vegetables on top of the meat.
Pour a full jar of RAGÚ® Double Cheddar Sauce on top of the vegetables. Place the lid on the slow cooker. Cook on high for 3 hours or low for 5 hours.
When cooking has completed, remove the lid and stir the mixture to combine. Season to taste with salt and pepper. Spread the hot mashed potatoes on top of the cheese, meat, and vegetable mixture.