Preheat oven to 400 F degrees. Grease two standard muffin tins or line with paper cups.
In a medium bowl, pour boiling water over oatmeal. Stir to moisten and set aside.
In a large bowl, combine flour, sugar, baking powder, cinnamon, baking soda and salt. In another bowl, combine eggs, buttermilk and oil. Stir wet mixture into the flour mixture, just until combined.
Spoon batter into prepared muffin pans. Fill each about 2/3 full. Bake for 20 minutes or until a wooden toothpick inserted in centers come out clean. Cool in pans on a wire rack for five minutes, then remove from pans.
Whisk together confectioners’ sugar and milk to form a glaze. Drizzle over muffins and serve.