Cook sausage according to package directions. Cool slightly, cut into 1/4 inch slices. Place English muffin cubes in the bottom of a greased 13x9 baking dish Drizzle with butter. Layer with sausage, cheese, onion and bell pepper. In a large bowl, combine the eggs, milk, salt and pepper. Pour over cheese. Sprinkle with bacon, cover and refrigerate overnight.
Remove from the fridge 30 minutes before baking. Uncover and bake 350 for 45-50 minutes or until a knife inserted in the center comes out clean. Let stand.