Preheat your oven to 350°F (180°C). Line two baking trays with parchment paper.
Melt the unsalted butter in a large stainless steel pan over medium heat until golden brown.
Transfer browned butter into a glass measuring cup and cool in the fridge until between 70°F and 75°F.
Press Libby’s Pumpkin Puree with paper towels to absorb excess moisture until it feels dry.
Whisk together both sugars until they resemble wet sand, then add egg yolks, vanilla, and dried pumpkin puree.
Fold in flour, pumpkin spice, cream of tartar, baking soda, and kosher salt until just combined.