OPTIONAL TOPPINGS: additional vanilla yogurt, strawberries, blueberries and granola
In a small bowl, combine yogurt and banana. In a shallow bowl, whisk egg, milk, cinnamon and nutmeg. Dip both sides of each tortilla in egg mixture. In a skillet, heat butter over medium-high heat. Add tortilla; cook until golden brown, 1-2 minutes on each side.
Spoon yogurt mixture down center of tortillas; top with strawberries, blueberries and granola. Roll up each tortilla. If desired, top with additional yogurt, berries and granola.