The original recipe is in black and the changes I have made are in red - I have made this many times over the years and found my changes to improve it a little (but it was good to begin with so if you don't want to try my changes you'll still end up with a good casserole).
Sausage Breakfast Casserole
2 lbs Pork Sausage
9 large Eggs * I always use 10 - I think it works better with the extra egg
3 cups Milk
2 tsp. Dry Mustard
2 tsp. Salt * I only use 1- 1 1/2, I think 2 is too salty ( maybe I use salty sausage)
* Pepper to taste
3 or 4 slices White Bread cut into cubes
3 cups shredded Cheddar Cheese
Brown the Sausage till crumbly and no longer pink. Drain grease. Whisk Eggs, Milk, Mustard, Salt, Pepper. Stir in Sausage, Bread cubes, and Cheese. Pour into a greased 9 x 13 pan, cover and chill overnight or 8 hours. Bake at 350 for 1 hour or until knife inserted in the center comes out clean.
Enjoy!