Heat the oven: Preheat to 325°F (165°C).
Line a large rimmed baking sheet with parchment paper for easy cleanup.
Mix the dry ingredients: In a large bowl, add 4 cups rolled oats, 1 cup chopped nuts, 1/2 cup seeds, 1/2 cup unsweetened coconut, and 2 tablespoons ground flaxseed or chia. Stir in 1/2 to 3/4 cup protein powder and 1 teaspoon cinnamon with a pinch of salt.
Whisk the wet ingredients: In a separate bowl, whisk 2 egg whites until frothy (10–15 seconds). Add 1/3 cup melted coconut oil, 1/3 cup maple syrup or honey, and 2 teaspoons vanilla.
Whisk to combine.
Combine: Pour the wet mixture over the dry ingredients. Stir until everything is evenly coated and no powdery spots remain. The mixture should feel slightly damp but not sticky.
Press and shape: Spread the mixture on the baking sheet in an even layer.
Press it down firmly with the back of a spatula to help form clusters.
Bake low and slow: Bake for 15 minutes. Rotate the pan, gently break the granola into large pieces, and bake another 10–15 minutes, until golden at the edges and fragrant. For big clusters, do minimal stirring.
Cool completely: Remove from the oven and let it cool on the pan without touching it for 30–45 minutes.
It will crisp as it cools.
Add extras: Once fully cool, fold in 1/2 cup dried fruit or chocolate chips if you like. Avoid baking chocolate or dried fruit—they can burn or melt.
Serve and enjoy: Eat with Greek yogurt, milk, or kefir. It’s also great on smoothie bowls or as a hiking snack.