Grease a 12 cup muffin pan or use paper liners. Pre-heat oven to 400 degree
In a medium mixing bowl combine the oats and milk, let stand for 5 minutes.
In a large bowl combine flour, baking powder, salt and cinnamon, mix with a fork to combine. Make a large well in the center of the flour mixture, set aside.
To the oat and milk mixture add the maple syrup, melted butter and slightly beaten egg. Stir to incorporate. Add the oatmeal mixture all at once to the flour mixture, stir until just moistened. Batter will be lumpy. Fold in 1/4 cup chopped walnuts.
Spoon batter into prepared muffin tin, filling 2/3 full. Sprinkle with remaining 1/4 cup chopped walnuts. Bake at 400 degrees for 15 - 18 minutes, or till golden brown. Cool in muffin tins for 10 minutes. Remove from tins and serve warm.
Bonus Spiced Maple Butter: Ingredients = 1/2 cup butter, room temperature, 2 Tablespoons maple syrup, 1/4 teaspoon cinnamon. In a large bowl , beat the butter, maple syrup and cinnamon till fluffy. Place in a container, cover and chill for up to a week. Serve at room temperature.