Sissy's Pasta Bake

I tried a few bites of this at my sister's and I. CAN'T. WAIT. to cook this at home!! It was so stinkin good!!

1 cup chopped onion

1 cup chopped green pepper

1 Tbls butter

1 can (28 oz) tomatoes with liquid, cut up

1 can (4 oz) mushrooms, drained (or can use fresh mushrooms)

1 can (2 1/4 oz) sliced olives

2 tsp dried oregano

1 lb ground beef, browned and drained

12 oz pasta shells, cooked and drained

2 cups shredded cheddar cheese

2 cans cream of mushroom soup

1/2 cup water

1/4 grated parmesan cheese

In a large skillet, saute onion and green pepper in buttter until tender. Add tomatoes, mushrooms, olives and oregano. Add ground beef and cook through. Place half the cooked pasta shells in a 9x13 casserole dish. Top with half of the skillet mixture. Sprinkle with 1 cup of cheddar cheese. Repeat layers. Mix the soup and water until smooth; pour over casserole. Sprinkle with parm. Bake uncovered at 350 degrees for 30-35 minutes