Start water boiling for pasta and preheat oven to 350F. In a large skillet start browning meat. When just starting to brown, add mushrooms and season mixture with garlic and pepper. Mix well and brown meat rest of the way along with mushrooms. Drain grease and return mixture to skillet. Mix in sauce, cover and let simmer.
Boil pasta until tender. Drain well.
In a 9x13 glass pan, add drained pasta. Carefully and with two hands (skillet will be heavy), add sauce. Mix well and make sure spaghetti is evenly spread across pan. Top with 1 1/2 bags of shredded Italian cheese.
Bake for 15 minutes or until cheese is completely melted. Enjoy.