Preheat oven to 375F and line a baking sheet with parchment paper.
In a microwave-safe bowl, combine brown sugar and butter. Microwave for 15 seconds, then stir. If needed, microwave for additional 10-second increments until butter is completely melted. Stir well.
Add the maple syrup to the melted butter mixture, followed by the cookie butter, stirring to combine.
Add the pumpkin seeds to the mixture, stirring to coat the seeds well.
Transfer the seeds to the prepared baking sheet, spreading them out evenly over the surface. If desired, sprinkle seeds with salt. Roast for 10-15 minutes, stirring after each 5-minute increment, until seeds are golden-brown.
Remove from oven and let cool on the baking sheet. Once cool, break apart clusters of seeds, if needed, then serve and enjoy.
Notes
It's important to ensure your pumpkin seeds are dry before coating them with the mixture. If you're using seeds you scooped from a pumpkin and rinsed, towel dry or air dry them well, or pop them in an oven at a low temperature for a few minutes to dry completely. You can also buy raw pumpkin seeds online.
I used Biscoff cookie butter, but other brands should work fine as well.
Pumpkin seeds can be stored in an airtight container at room temperature.