Crafting these cookies is straightforward and rewarding. Follow these steps to achieve the perfect batch of pumpkin spice butter cookies:

1. Preheat Your Oven: Set the oven to 350°F (175°C) and line two baking sheets with parchment paper.
2. Cream the Butter and Sugars: In a large mixing bowl, cream together the softened butter, granulated sugar, and brown sugar until the mixture is light and fluffy. This should take about 2-3 minutes using an electric mixer on medium speed.
3. Add Egg and Vanilla: Beat in the egg and vanilla extract until well combined.
4. Combine Dry Ingredients: In a separate bowl, whisk together the flour, baking soda, salt, and pumpkin spice mix.
5. Mix Dry and Wet Ingredients: Gradually add the dry ingredients to the wet mixture, stirring until just combined. Be careful not to overmix.
6. Fold in Nuts: If using, gently fold in the chopped pecans or walnuts.
7. Shape the Cookies: Scoop tablespoon-sized amounts of dough and roll them into balls. Place them on the prepared baking sheets, leaving about 2 inches of space between each cookie.
8. Bake: Bake in the preheated oven for 10-12 minutes or until the edges are lightly golden. The centers may appear slightly underbaked, but they will firm up as they cool.
9. Cool: Allow the cookies to cool on the baking sheet for about 5 minutes before transferring them to a wire rack to cool completely.