"This Overnight Breakfast Casserole is not only a crowd-pleaser but also a cook-pleaser because it's so simple to make! Perfect for your Christmas morning!..."
INGREDIENTS
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12 slices bread (such as challah, brioche or any egg bread, preferably day old bread)
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1 tbsp olive oil
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1 large onion (chopped)
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1 lb Italian sausage (casings removed)
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1 tsp dry mustard
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1/2 tsp salt (or to taste)
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1/2 tsp pepper (or to taste)
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1 medium red bell pepper (finely chopped)
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3 green onions (chopped)
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2 cups cheddar cheese (shredded)
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8 large eggs
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2 cups milk