Add rolled oats to a chopper or food processer and pulse until oats are various textures, not powder.
In a large mixing bowl, add oats, flour, baking powder, baking soda, and salt. Whisk to combine. Set aside.
In a separate large bowl, beat butter using a hand mixer. Add brown sugar and granulated sugar and beat until mixture is light and fluffy.
Add the eggs into sugar mixture, beating between each addition. Add vanilla and mix well.
Add ½ of the dry ingredients into the wet mixture and beat on low until incorporated. Now add remaining flour mixture and beat until fully incorporated.
Using a heaping tablespoon, roll the dough into balls and place on prepared baking sheet(s) two inches apart.
Bake for 10-12 minutes.
Remove from oven, let cool for 5 minutes, then transfer cookies to a wire rack. Allow cookies to cool completely.
In a medium mixing bowl, combine powdered sugar, cream, and maple syrup. Whisk until sugar is dissolved and ingredients are well combined.
Dip tops of cooled cookies into icing and place back onto wire rack to allow icing to set.