The "Loaded" Breakfast Casserole My Family Begs Me to Make (I Love How Easy It Is!)

"Bonus: You can assemble it ahead of time...."

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