Brown Sugar Walnut Muffins

Hearty without being heavy, these muffins best consumed the day they are baked. As if you could wait.
Ingredients:
thick-cut rolled oats 2 cups
whole milk or milk substitute 1 cup
brown sugar 1½ cups
unsalted butter 4 ounces melted and cooled
whole eggs 2 at room temperature
baking powder 1 Tbl. + 1 tsp.
unbleached all-purpose flour 2 cups
walnuts 1 cup toasted and chopped
Procedure:
  1. Mix oats, milk and sugar. Let sit five minutes.
  2. Stir in cooled melted butter and eggs.
  3. Mix in dry ingredients until just combined.
  4. Fold in nuts.
  5. Spoon into muffin cups and bake at 350º F. until an inserted toothpick emerges clean.