In a bowl, stir together the spelt flour, oats, cinnamon, baking soda, baking powder and salt.
In another bowl, mix the maple syrup, melted butter, eggs, banana and vanilla. Add the dry ingredients to the wet and stir together just until combined. Fold in your choice of addins like walnuts or chocolate chips, if desired and divide among the 12 muffin cups. Sprinkle with a pinch of oats or extra chocolate chips if desired and place in the oven.
Bake at 350 degrees for 15-18 minutes until a toothpick comes out clean. Cool completely before storing.
As always when measuring flour for baking, weighing is the most accurate. If you do not have access to a baking scale, cup measurements are provided, but be aware it is very easy to over measure flour, especially whole grain flour. If your muffins turn out too dry, use less flour next time, or weigh your flour!