Cheesy Pasta Shell Casserole

Awesome--everybody loves this! Very good with tossed salad and garlic bread.

Combine beef , onion , pepper , and sauce.

Simmer on low heat for 15 minutes.

In 9x13-inch baking dish pour 1 / 2 of the cooked shells.

Add 1 / 2 of the sauce mixture.

Layer with 6 slices of provolone.

Add a layer of the sliced portabella.

Cover mushrooms with sour cream.

Add remaining shells.

Add remaining sauce.

Cover with mozzarella.

Bake covered at 350f for about 40 minutes.

medium pasta shell, pasta sauce, ground beef, onion, green pepper, provolone cheese, mozzarella cheese, sour cream, portabella mushroom