Everything Cheesy Potato and Egg Casserole

Bahan-bahan (8 porsi)

• 3 cups leftover mashed potatoes
• 3/4 cup whole milk
• 1 cup shredded sharp cheddar cheese
• 1/2 cup shredded Havarti cheese
• kosher salt and black pepper
• 2 cups fresh spinach, roughly chopped
• 8 slices thick cut bacon
• 8 large eggs
• 1/4 cup fresh basil leaves
• 2 tablespoons fresh dill
• 3 tablespoons everything bagel spice
• crushed red pepper flakes