Melt 1 1/2 tablespoons butter in a heavy saucepan. Blend in flour, stir in milk slowly, and cook, stirring constantly, until mixture thickens. Add seasonings and cheese, stirring until cheese is melted. Add macaroni and transfer to a buttered 1-quart casserole dish or individual casseroles.

Combine bread crumbs and remaining 1 tablespoon melted butter. Sprinkle over macaroni.

Bake at 400°F for 20 minutes.