Preheat oven to 350o degrees and adjust oven rack to the middle position. Line a baking sheet with a silicone mat, or parchment paper.
In a small mixing bowl, whisk together the oats, flour, baking powder, salt and cinnamon.
In a medium mixing bowl, use a handheld mixer on medium speed to cream together the butter, sugar, maple syrup and vanilla extract until fluffy. Add the egg and beat for another minute, util the mixture is thoroughly combined.
Add half of the dry ingredients to the wet ingredients and mix together with a spatula until incorporated. Add the remaining dry ingredients and mix until no flour streaks remain.
Using a small cookie scoop or spoon, drop golf-ball size scoops onto the prepared baking sheet, about 1 inch apart. Evenly distributing the dough until you have 10 cookies.
Bake the cookies for 12 minutes, or until the tops are dry. Careful not to over bake as you want the cookies to be chewy and they will continue to cook as they cool on the baking sheet. Let the cookies cool on the baking sheet for 5 minutes then transfer to a wire cooling rack to cool completely. Make the Nutella Cream while the cookies are cooling.