Ro*Tel Mac 'n' Cheese

3 cups uncooked elbow macaroni
1/2 cup all-purpose flour
1/2 cup (1 stick) margarine
2 cups milk
4 cups (1 pound) shredded Cheddar cheese
1 (10 ounce) can Ro*Tel Diced Tomatoes and Green Chiles
Salt and pepper as desired

Cook macaroni and drain well.

While macaroni cooks, start the sauce. In a saucepan, melt margarine over low heat. Add flour, stirring constantly. Add milk, cheese, Ro*Tel and salt and pepper. Stir until cheese is melted and sauce thickens. Stir in macaroni and turn into a greased 9 x 13-inch baking dish. Bake uncovered at 375 degrees F for 30-45 minutes, or until heated through.