Everything Cheesy Potato and Egg Casserole

Ingredients

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