Preheat oven to 325 degrees. In a large bowl, mix together oats, walnuts, pumpkin seeds, flax, protein powder, cinnamon, and salt. Drizzle in honey and olive oil then stir well to evenly coat mixture.
Spread mixture in an even layer on a baking sheet and bake until golden, about 30 minutes (depending on how your oven runs I'd start watching at 20 minutes to prevent burning). Let cool completely before serving.