In a stand mixer fitted with a paddle attachment, add brown butter, unsalted butter, light brown sugar and vanilla.
Turn mixer on medium high speed, and cream until light and fluffy – approximately 2 to 3 minutes.
Add egg and mix on medium until well combined. Use rubber spatula to scrape down bowl and mix for a few seconds to ensure fully incorporated.
Add maple syrup and boiled apple cider. Mix on medium until well combined.
In a separate bowl, combine flour, baking powder and fine sea salt.
Add dry ingredients to wet ingredients, and mix on low until flour begins to combine with wet ingredients. Turn mixer on a bit higher to allow for more thorough mixing.
Add pecans and mix until well distributed – about 20 to 30 seconds.
Take two pieces of parchment paper and roll out dough to preferred thickness. Cut circular shapes (or other desired shape), and place at least 1" apart on baking sheet.
Place dough in refrigerator for a minimum of 2 hours, but no more than 24 hours. Cover with a cookie sheet cover, or plastic wrap.
After chill period, preheat oven to 375 F. Remove dough from refrigerator and bake for 10 – 11 minutes.
While baking, combine maple sugar, sugar and ground cinnamon for coating the cookies after baking. (optional)
Remove cookies from oven and place on wire rack to cool. Allow to cool for a minute before picking up and placing inside sugar mixture to coat. BE CAREFUL, COOKIES ARE HOT.
Allow to cool completely before decorating, or enjoying .