In a bowl, mix butter, sugar and salt. In another bowl, mix both flours and baking powder, then add them to the mixture of butter. Add 3/4 cup of oatmeal and stir. In a third bowl, stir milk and maple syrup. Pour the mixture of maple syrup on the dough and stir until the mixture is wet, taking care not to stir too much.
Spread the dough in 8 greased muffins tins. Sprinkle with remaining oatmeal (1 tablespoon). Bake in a preheated oven of 350 F for 20 to 25 minutes or until a toothpick inserted in a muffin comes out clean. Let cool on a rack for about 5 minutes. Remove the muffins from the pan and let cool completely. (They will be good up to 3 days in the refrigerator and up to 1 month in the freezer).