Add the butter and brown sugar to the bowl of a standing mixer. Mix until combined on low speed. Increase the speed to medium-high and whip for 1-2 minutes.
Add the maple syrup, egg, vanilla and maple extract. Mix on low until combined.
Stop the mixer and pour the dry ingredients on top. Add the flour, baking soda and salt. Mix on low until the dough forms.
Remove from the mixer bowl and place on a piece of plastic wrap. Wrap it up tight and place in the fridge for 1-3 hours to chill.
When ready to bake, preheat your oven to 350 degrees.
Remove the dough from the fridge and scoop it with a cookie scoop onto light metal cookie sheets, lined with parchment paper. Bake for 13-14 minutes.
Remove and cool for 10 minutes on the pan before removing them to finish cooling.
Glaze
Once the cookies are done, in a small bowl, whisk all the glaze ingredients until they are smooth.
Drizzle the glaze all over the cookies. Let it set before serving.