I found this old recipe and have no idea where I originally got it from. I can tell you it is worth the effort to make it the night before!
6 onion rolls or your favorite bread
1 cup grated cheddar cheese
1 1/2 sticks butter
1 – 8 ounce package cream cheese
2 cups milk
1/2 teaspoon dry mustard
dash of cayenne pepper
1/2 teaspoon salt
1 teaspoon chopped chives
1 pound of fried, drained and crumbled bacon bits (prepped the night before)
Generously butter 9 x 13 baking dish. Tear onion rolls into chunks. Sprinkle with cheddar cheese, then tear cream cheese into small piece and place over the top. Cut 1 1/2 sticks butter into pats and place over the top. Mix remaining ingredients and pour over the top of the dish. Cover and refrigerate overnight.
The next morning, bake at 325 degrees, covered, for 45 minutes. Then remove foil, add bacon topping and continue baking at 350 for 10-15 minutes. Garnish with chopped chives!