Cook the macaroni according to package directions; drain well.
Meanwhile, warm the milk and cream in a small saucepan over medium heat, or in a glass measuring cup in a microwave oven for about 2 minutes. Do not boil.
In another saucepan, melt the butter and add flour, stirring until a paste forms. Pour the warmed milk into the butter mixture and cook, stirring constantly, until thick and creamy. Add cheese a little at a time, stirring until melted.
Stir in tomatoes, chiles and seasonings. Combine the hot macaroni and the sauce, blending well. Pour into a buttered, 2-quart casserole dish. Bake uncovered at 400° F for 35 to 40 minutes, or until top is nicely browned.
Servings: