Line a baking sheet with parchment paper and spread the pumpkin seeds evenly. Bake the seeds for 13-15 minutes, until evenly browned. Remove from the oven and let the pumpkin seeds cool completely.
Place the seeds in your food processor and add the oil, salt and optional vanilla extract. Blend for about 20 minutes, stirring intermittently, until it becomes smooth.
Add the maple syrup and blend for a few more seconds until it's mixed in.
Notes
If you want to make this butter sugar free, omit the maple syrup and add an extra 2 tablespoon of oil.
Nutritional values are an estimate and will vary depending on the exact ingredients used and the serving size.