Evenly stack bite-sized bread pieces in a 9" x 13" baking dish. This recipe works with wheat or white bread, not sweet or seedy. TIP: Taller casseroles? I love using leftover hamburger or hotdog buns instead of bread.
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Step 1
Cover bread with ham. TIP: This casserole uses leftover ham well. I buy diced ham to save time. Top ham with 1-1/2 cups cheese. Mix eggs, 2-1/2 cups milk, and mustard in a small bowl.
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Step 2
Whisk eggy mixture.
Egg-filled casserole baked.
In same bowl, mix soup and 1/2 cup milk.
Whisk together.
Evenly cover casserole with soup.
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Step 3
Sprinkle remaining 1/2 cup cheese over mushroom mixture.
Cover and chill 8 hours or overnight.
Next morning, heat oven to 300°F.
Bake 90 minutes uncovered.