Prepare by browning the butter. Melt butter on medium heat. Once completely melted, the butter will begin to foam. Keep stirring for 5-8 minutes. Two indications that the butter has browned are when the butter creates a nutty aroma and there will be golden brown milk solids at the bottom of your pan. Remove from heat and transfer to a glass cup and allow to sit for 20 minutes to cool while you prepare the rest of your ingredients.
In a large bowl, whisk together dark brown sugar and browned butter. Add in egg yolk, vanilla, maple syrup, and pumpkin. The mixture will be smooth.
1 cup butter, 1 cup dark brown sugar, 1 egg yolk, 1 tbsp vanilla, 3 tbsp maple syrup, 1/3 cup pumpkin puree
In a separate smaller bowl, add in flour, baking soda, baking powder, cinnamon, pumpkin pie spice, nutmeg, and salt.
2 1/4 cups flour, 1 tsp baking soda, 1/2 tsp baking powder, 1 tsp cinnamon, 1/2 tsp pumpkin pie spice, 1/4 tsp nutmeg, 1/4 tsp salt
Add dry into wet ingredients and fold using a spatula. The dough will be super soft.
In a small bowl, mix together both sugars and cinnamon. This will be what you dip the cookie balls in. Set aside.
1 1/2 tbsp brown sugar, 1 1/2 tbsp white sugar, 1/2 tsp cinnamon
Roll the dough into 12 even balls. The balls should be soft but not sticky. Drop into the cinnamon sugar mixture and toss to coat.
Place on the baking sheet and bake 6 cookies at a time at 350°F for 10-12 minutes.
The cookies will be done when the edges have darkened and the centre has puffed. There may be slight cracks as well indicating they are finished.
Allow to sit on the cookie tray for 5 minutes, then transfer to a cooling rack. Top with flakey sea salt (optional). Enjoy!