Recipe: Slow Cooker Sausage and Spinach Breakfast Casserole

Ingredients

• Cooking spray
• 1 pound uncooked pork breakfast sausage, casings removed
• 1 small yellow onion, diced
• 1 1/2 teaspoons dried oregano
• 5 ounces baby spinach (about 5 packed cups)
• 1 pound frozen diced potatoes (do not thaw, about 4 cups)
• 1 1/4 cups shredded Swiss cheese, divided
• 1/4 cup grated Parmesan cheese, plus more for serving
• 8 large eggs
• 2 cups whole or 2% milk
• 2 teaspoons Dijon mustard
• 1 1/2 teaspoons kosher salt
• 1/4 teaspoon freshly ground black pepper
• Red pepper flakes or hot sauce, for serving

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