Prepare the Brown Butter: In a medium saucepan over medium heat, add the unsalted butter and stir constantly as it melts. Keep cooking until the butter turns a rich, golden brown and emits a nutty aroma, which should take about 5-7 minutes. Once you're satisfied with the color and scent, remove the saucepan from heat and allow the butter to cool slightly.
Mix the Wet Ingredients: In a large mixing bowl, combine the warm brown butter with granulated sugar and brown sugar. Using an electric mixer, beat the mixture until it achieves a smooth and creamy consistency. Add the pumpkin puree, egg, and vanilla extract to the bowl, mixing everything together until fully integrated.
Combine the Dry Ingredients: In a separate bowl, whisk together the all-purpose flour, baking soda, cream of tartar, salt, ground cinnamon, ground ginger, and nutmeg. Gradually add this dry mixture to the wet ingredients, stirring gently until just combined. Be careful not to overmix to maintain the cookie’s tender texture.
Chill the Dough: Cover the bowl with plastic wrap or transfer the dough to an airtight container and refrigerate for at least 1 hour, or up to 24 hours if you want to develop even deeper flavors. Chilling the dough will also make it more manageable for rolling.
Preheat the Oven: When you're ready to bake, preheat your oven to 350°F (175°C). Line a baking sheet with parchment paper to prevent sticking.
Roll the Cookies: In a small bowl, combine the granulated sugar and cinnamon for rolling. Using a tablespoon, scoop out a portion of dough and roll it into a ball. Roll each dough ball in the cinnamon-sugar mixture until thoroughly coated.
Bake: Arrange the coated dough balls on the prepared baking sheet, leaving about 2 inches of space between each. Bake in the preheated oven for 10-12 minutes, until the edges are firm but the centers remain soft. After baking, allow the cookies to cool on the baking sheet for 5 minutes before transferring them to a wire rack to cool completely.
Serve and Enjoy: Once cooled, your delightful cookies are ready to be shared with family and friends or savored alongside a warm cup of your favorite beverage!
Notes
Chill the dough for deeper flavors and easier handling.