01 - Preheat the oven to 350°F. Line a baking sheet with parchment paper.
02 - In a medium bowl, combine pumpkin seeds, sunflower seeds, sesame seeds, and flaxseeds.
03 - Drizzle olive oil over the seeds and sprinkle with sea salt, smoked paprika, garlic powder, and cayenne pepper if using. Toss thoroughly to coat evenly.
04 - Spread the seasoned seeds in a single layer on the prepared baking sheet.
05 - Roast in the preheated oven for 12 to 15 minutes, stirring once halfway through, until seeds are golden and fragrant.
06 - Remove from oven and let cool completely before storing in an airtight container.