Directions: Cook noodles according to package directions. Drain and set aside.
Heat a large skillet over medium-high heat. Add the ground beef and onions and cook, stirring frequently, until the beef is no longer pink and the onions are soft. Drain off excess grease. Stir in the spaghetti sauce, mushrooms, and Italian seasoning. Mix well.
Mix together the two cheeses and set aside.
Lightly grease the inside of the crock pot. In the bottom of the crock pot, spread about 1/3 of the meat sauce. Cover with 1/3 of the cooked noodles, and a layer of pepperoni slices. Top with 1/3 of the cheese mixture. Repeat the layers ending with the cheese.
Cover the crock pot and cook on low heat for 3 hour or until everything is heated through and the cheese is melted. Serve hot.
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