Preheat your oven to 350°F (175°C).
In a large bowl, combine oats, flour, baking soda, salt, and cinnamon. Mix thoroughly.
In a stand mixer, cream together the butter and sugar.
Beat on low speed until the mixture is pale and fluffy.
Add the maple syrup, vanilla extract, and egg to the butter and sugar mixture. Beat for one minute until well combined.
Gradually incorporate the dry ingredients into the mixing bowl, blending until fully integrated.
Chill the dough in the refrigerator for 5-8 minutes to reduce stickiness, but be sure to set a timer; forgetting it may result in a dough that's difficult to scoop.
Remove from refrigerator and use a cookie scoop or tablespoon to form balls and place them about 2 inches apart on a baking sheet.
Bake for 12-15 minutes until the cookies are golden brown, being careful not to overbake.