Preheat oven to 350 F and grease a 9X13 baking pan.

Brown sausage and drain.

Beat eggs, milk and mustard together.

Add bread cubes, sausage and 1 1/2C cheese to the egg mixture. Stir until evenly coated.

Transfer to baking pan, sprinkle remaining cheese on top, and bake for 40-45 minutes.