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1
Preheat oven to 375u00b0F degrees. Cut loaf of bread into 1 inch slices, then roughly tear into large pieces (around 3 inches). Place on baking sheet and toast in oven for 10 minutes tossing once. (You may skip this step if using day old bread, as long as it's fairly dry.).
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2
Heat large skillet over medium high heat, crumble loose sausage into pan and cook until no longer pink (about 7-9 minutes). Remove sausage from skillet and place in bowl large enough to accommodate sausage and bread.
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3
Pour off and discard all but 1 tablespoon of fat from skillet and add onion. Cook over medium low heat until soft and brown, 5-7 minutes. Add onion and torn bread to sausage and toss. Add 1 cup of shredded cheddar cheese and toss again.
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4
Butter a 9 x 13 x 2 inch Pyrex baking dish. Beat eggs well then beat in milk and sour cream til smooth; season with salt and pepper.
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5
Place sausage/bread/onion/cheese mixture into buttered dish and pour milk/egg mixture over, pressing down on the bread with a spatula to insure that the egg begins to soak up the liquid. Sprinkle with remaining shredded cheese and scallion (if using), cover and place in fridge overnight.
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6
The following morning (or early afternoon) preheat oven to 350u00b0F Bake until browned and puffy, about 45-50 minutes. Serve hot with a Bloody Mary. Pass sour cream, hot sauce in general (sriracha specifically), ketchup, salsa, or sliced avocados; if you have the energy, top each serving with a runny fried egg.
