Preheat oven to 425°F. Grease and flour a 12-cup muffin tin.
Combine spelt flour, brown sugar, baking powder and salt. In a separate bowl, beat together the milk, eggs and oil. Mix wet ingredients with dry ingredients just enough to moisten. Gently fold in any optional mix-ins.
Fill muffin cups 2/3 full and bake for 17 minutes, or until light brown in color.