Cheesy Sausage & Spinach Egg Bake: My Crowd-Pleaser

Ingredients

• 12 large eggs
• 1 cup whole milk
• 1/2 cup heavy cream
• 1 teaspoon Dijon mustard
• 1/2 teaspoon salt
• 1/4 teaspoon black pepper
• 1/4 teaspoon garlic powder
• 1 pound breakfast sausage, removed from casings
• 1 medium onion, diced
• 2 cloves garlic, minced
• 5 ounces fresh spinach, roughly chopped
• 2 cups shredded cheddar cheese
• 1 cup shredded mozzarella cheese
• 2 tablespoons olive oil