Brown sausage and drain well. Set aside.
Whisk eggs until foamy.
Add milk, Colman's Mustard, salt and pepper.
Gently fold in bread, making sure all is combined.
Add sausage and cheese. Stir well.
Cover bowl and refrigerate overnight.
Preheat oven to 350º.
Pour into greased 9 by 11 inch pan.
Bake for 45-50 minutes. When a knife inserted in middle comes out clean, it's done!