01 - Set the oven temperature to 325°F and line a baking sheet with parchment paper.
02 - Place sunflower seeds, pumpkin seeds, and sesame seeds if used into a mixing bowl.
03 - Drizzle olive oil over the seeds and toss thoroughly to ensure even coating.
04 - Sprinkle fine sea salt and smoked paprika or chili powder if using, then mix well to distribute flavors.
05 - Spread the seed mixture evenly in a single layer on the prepared baking sheet.
06 - Bake seeds for 12 to 15 minutes, stirring once halfway through, until golden and aromatic. Monitor closely to prevent burning.
07 - Remove from oven and allow seeds to cool completely on the baking sheet; they will become crisp as they cool.
08 - Transfer cooled seeds to an airtight container and keep at room temperature for up to one week.