Whisk flour, baking soda and salt together, set aside.
Brown butter in small skillet over medium heat. Swirling frequently, until foaming subsides and butter begins to brown. Should have a nutty aroma. 7-9 minutes.
Transfer browned butter to bowl and whisk in spices. Then whisk in brown sugar, molasses. Next add egg and yolk and whisk until just combined.
Add wet ingredients to flour mixture and whisk until incorporated. Cover and let chill for 1 hour in the fridge.
Pre-heat oven to 300 degrees. Divide dough into 1 inch balls, roll in granulated sugar. Place onto prepared baking sheet and bake on the middle rack for 25-27 minutes, rotating baking pan 180 degrees halfway through.
Notes
Store in an air tight container for up to a week. Dough can be stored in fridge, tightly wrapped up to three days. Dough can be wrapped and frozen for 6 months.