Place sausage and croutons in a greased 13-in.x9-in.x 2-in.baking dish.
In a large bowl, beat eggs.
Stir in cheese, milk and salt; pour into pan.
Bake, uncovered, at 325° for 45-50 minutes or until a knife inserted near the center comes out clean.
Let stand 5 minutes before cutting.
Garnish with tomato slices if desired.