Here's mine. It works with ham, bacon or cut-up smokey links.
Grease 9 x 13 pan. Remove crusts from 6-8 pieces of bread (enough to fit bottom of pan) Butter both sides of bread and place in pan.
Sprinkle with 1 to 2 cups of sharp shredded cheddar.
Add meat on top of the cheese.
Whisk together 12 eggs, 1 cup milk, 1/2 tsp dry mustard, and 1 tbs salt.
If desired, add 1 small can diced green chile to the egg mixture. (In my home, this is a requirement but your family may not care for spicier food. It's perfectly good either way.)
Pour egg mixture evenly over bread/meat. Cover pan with foil and refrigerate overnight.
In the morning, preheat oven to 300 degrees. Cook 45-60 minutes--until a knife inserted in center comes out clean.
I make this all the time and just brought it to a department luncheon yesterday. It was all gone by 10:00 a.m.