I used: 3 cups of penne pasta, added a small can of diced tomatoes, just half a big onion, mozzarella cheese instead of cheddar.
First I sauteed the onion and mushrooms with 2 tbsp olive oil and 1 tsp of minced garlic. Then I added the meat (I used 1 lb. extra lean ground beef because I didn't wanted to drain fat). I added the Italian seasoning to the meat while browning. When the beef was brown, I added the jar of spaghetti sauce, a small can of diced tomatoes and the bacon bits. I stirred and let it simmer in low heat for awhile. Then mixed it with the penne pasta (I used 3 cups, instead of 4) on the baking dish and topped with lots of Mozzarella cheese, 'cause my family likes it cheesy! Very tasty. I will be making this again. :)