Preparation Whisk egg white, oil, honey, pepper (if using), salt, and 1 Tbsp. water in a medium bowl to combine. Add sunflower seeds, chia seeds, flaxseeds, and sesame seeds and stir to coat. Let sit until liquid is absorbed, about 30 minutes. Preheat oven to 325°F. Spread seed mixture in an even layer on a rimmed baking sheet. Bake, stirring very gently after 10 minutes to encourage the mixture to form small clusters, until golden brown and crisp, 20–25 minutes. Let cool. Do Ahead: Sprinkle can be made 2 weeks ahead. Store in an airtight container at room temperature.