mmmm.....homemade mac & cheese

2 c. Pasta (shell or spirals)
1/4 c. each grated cheddar, monterey jack, and provolone cheese (I just used colby jack and mozzarella since that's what I had)
1/2 c. sour cream
1 (15 oz) can diced stewed tomatoes (I used the kind with garlic & onion also)
1 Tbs butter
2 tsp fresh oregano (I actually left this out completely)

Preheat oven to 350.  Cook macaroni according to package directions, drain, and transfer to a 4-cup casserole dish.  Stir in remaining ingredients (sprinkle more cheese :) and bake until bubbling, about 30 mins.