Skip the empty calories from store-bought and coffee-shop muffins, and make your own instead. When done right, a muffin can actually be a filling and nutritious breakfast. This recipe for banana smoothie muffins is filled with a healthy secret ingredient you won't even taste — spinach! Or opt for a low-sugar, high-protein raspberry muffin instead. If a slice of breakfast bread is more your thing, then try this recipe for coconut banana bread.