Overnight Croissant Breakfast Casserole Bake with Gravy

"This Overnight Croissant Breakfast Casserole Bake with Gravy is the perfect way to start the day. Loaded with sausage, egg, and cheese and croissants. Everyone loves this easy breakfast casserole!!..."

INGREDIENTS
1 tablespoon olive oil
1 small onion peeled and chopped
1 pound roll breakfast sausage mild flavor
4 large butter croissants or 8 small croissants
1 cup shredded cheddar cheese
6 large eggs
1/2 cup heavy whipping cream
3 cups milk (whole milk recommended) divided
1/2 teaspoon dry mustard powder
1/2 teaspoon salt (plus additional for the gravy to taste)
1/2 teaspoon black pepper (plus additional for the gravy to taste)
1/4 teaspoon paprika
1/4 teaspoon garlic powder
2 tablespoons butter
3 tablespoons all-purpose flour
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