"Bonus: You can assemble it ahead of time...."
INGREDIENTS
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Cooking spray
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1 tablespoon olive oil
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1 pound uncooked breakfast sausage, casings removed if needed
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1 medium yellow onion, diced (about 1 1/2 cups)
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1 medium red bell pepper, diced (about 1 1/2 cups)
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1 1/2 teaspoons kosher salt, divided
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3 ounces baby spinach (about 3 packed cups)
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12 large eggs
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2 cups half-and-half
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1 tablespoon Dijon mustard
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1/2 teaspoon freshly ground black pepper
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1 (20-ounce) bag frozen shredded hash brown potatoes (do not thaw, about 6 1/2 cups)
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6 ounces sharp cheddar cheese, shredded (about 1 1/2 cups), divided