Line two baking sheets with parchment paper.
Spread out the pecans and walnuts on one baking sheet, and the pumpkin seeds on the other.
Roast the nuts for 12-18 minutes, tossing the nuts every few minutes. For me, the walnuts and pecans were deeply roasted & fragrant after 14 minutes, and the pumpkin seeds after 18.
Let the nuts cool slightly, then add to a high speed blender or food processor with the salt.
Blend starting on low, then increase the speed to medium. Blend until completely smooth, scraping down the sides a few times to get any remaining chunks.
Add the spices and vanilla and blend to combine.
Store in a glass container and seal with a lid once the nut butter has cooled.
