Spinach Florentine Breakfast Casserole

Ingredients

• 1 ( 10 - ounce ) package frozen chopped spinach , thawed and drained
• 1 tablespoon olive oil , plus more for greasing
• 1 medium yellow onion , chopped (about 1 cup )
• 3 clove garlic , finely chopped
• 1 ( 8 - ounce ) container mascarpone cheese (about 1 cup)
• 4 ounces Parmesan cheese , grated on a Microplane (about 1 cup), divided
• 2 teaspoons kosher salt , divided
• 1 teaspoon freshly ground black pepper , divided
• 10 large eggs
• 1 2/3 cups half-and-half
• 1/4 teaspoon crushed red pepper
• 6 English muffins , split

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