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, chile and seasonings.
Combine the hot macaroni and the sauce, blending well. Pour into a buttered,
2-quart casserole dish.
Bake uncovered at 400 degrees F for 35 to 40 minutes, or
until top is nicely browned.