Marilyn's Mac and Cheese

2 cups shell macaroni
1/4 cup each grated sharp Cheddar, Monterey Jack, and provolone cheese
1/2 cup sour cream
1 15-oz. can diced stewed tomatoes, drained
1 T. unsalted butter
2 tsp. fresh oregano

Preheat oven to 350 degrees. Cook macaroni according to package instructions, drain, and transfer to a 4-cup casserole dish. Stir in remaining ingredients and bake until bubbling, about 30 minutes.

Serves 6.

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