In large skillet, brown sausage 5 minutes; drain fat. Add milk and flour; mix well. Bring to a boil over medium high heat, stirring constantly. Remove from heat. Stir in pasta, cheeses, garlic salt and seasoned pepper.

In 1 1/2 quart baking dish, place pasta mixture. Bake in 350F oven, uncovered, 25 minutes. Sprinkle with bread crumbs (or croutons); place under broiler just to brown.