Preheat oven to 350 degrees. Spread 3 cups of sunflower seeds on a large baking sheet. Roast for 20 minutes or until golden and fragrant.
Put the sunflower seeds in a food processor and blend on high, scraping down sides when needed. This time varies but I've found it can take up to 15 minutes until it gets to the creamy consistency of butter. Add 1-2 tbsp of oil about halfway through (and more if desired). Store in a mason jar in the fridge!