When you really want to enjoy the company of your guest, prepare this dish ahead of time and bake it one hour before serving.
For 10 people
Brown sausage and drain on paper towels.
Butter a 9x13 in. ovenproof baking pan. Spread butter evenly on 6 slices of bread and layer in pan with the buttered side facing down.
Add a layer of sausage, spreading evenly, and then add a layer of cheese.
Cover the sausage and cheese layer using 6 buttered slices of bread with the buttered side facing up.
Mix together dry mustard and salt. Combine milk, eggs, mustard and salt.
Pour milk mixture over top of bread and allow standing overnight in the refrigerator.
The following day, bake at 350 degrees for 1 hour.
Remove from oven and allow 20 to 30 minutes before cutting into serving sized pieces.