These Spinach, Feta, and Egg Breakfast Sandwiches are a nutritious and delicious meal prep option perfect for busy mornings. Baked to perfection with fresh baby spinach, creamy feta, and fluffy eggs, these sandwiches combine wholesome ingredients with convenience. Made ahead and easily reheated, they provide a protein-packed start to your day with vibrant flavors and a satisfying texture on your choice of English muffins.