Take 10 bread slices. Cube them in to bite-sized portions.
1 lb. bulk pork sausage, cooked and drained.
1 4-oz. can sliced mushrooms, drained.
1 9-oz. package frozen cut asparagus, thawed and drained.
2 cups grated Cheddar cheese. (Mild, Medium, or Sharp - though the dish is versatile enough where you could any heavier cheese).
2 Tbsp. flour
1 Tbsp. dry mustard
2 tsp. dried basil leaves
1/2 tsp. salt
2 Tbsp. melted butter
8 eggs
3 cups milk
Preheat the oven 350 degrees. Grease 13x9" glass baking dish. Layer 1/2 of bread, cooked sausage, mushrooms, asparagus and cheese in dish. Repeat layers, ending with cheese.
In a large bowl, combine the remaining ingredients and beat well to full mixture. Pour over the layers in baking dish. Cover it well and refrigerate overnight. In the morning, preheat oven to 350 degrees.
Bake the casserole for 60 to 70 minutes until puffed and light golden brown.
Edited by Nemesis Juggernaut, : edit to add