I know this doesn't look like much, but it has the flavors of pizza, and my husband actually ate leftovers (that never happens with pasta)!
1 pound rotini pasta (or fusilli), cooked according to package instructions
2 cups cooked chicken, cubed (I took mine off a rotisserie chicken)
3 tablespoons butter
1/2 onion, chopped
1 green bell pepper, seeded, and diced
1 garlic clove, minced
3 tablespoons flour
2 cups chicken broth
1 cup sour cream
1 and 1/2 cup shredded cheddar cheese
1 and 1/2 cups shredded mozzarella cheese
1 can (14.5 ounces) diced tomatoes, drained
Preheat oven to 350 degrees. In a large skillet melt butter and saute onion, green bell pepper, and garlic for 2 minutes. Stir in flour and cook another 2 minutes, Whisk in chicken broth. Stir until it thickens slightly. Whisk in sour cream and add 1 cup cheddar cheese and 1 cup mozzarella cheese. Stir until melted. Add cooked pasta, chicken, and tomatoes. Season to taste with salt and pepper.
Spoon into a greased baking dish. Top with remaining cheese and sprinkle with oregano. Bake for 20-25 minutes.