1. In saucepan, melt butter. Remove from heat; blend in flour, salt, and mustard.

2. Add milk; heat, stirring constantly, until sauce thickens a little and is smooth.

3. Add 1 1/2 cups cheese; heat until melted, stirring occasionally.

4. Meanwhile, cook macaroni as directed; drain.

5. Combine with sauce in a 2-quart casserole; top with remaining cheese, bread crumbs, and paprika.

6. Bake at 375 degrees about 20 to 25 minutes or until nicely browned and bubbly.