Preheat the oven to 275ºF (135ºC) and make sure an oven rack is in the center position. Line a half sheet baking pan with parchment paper and set aside.
In a medium bowl, add the oats, nuts and seeds, coconut flakes, millet, crystallized ginger, ground ginger, cinnamon, and salt. Mix everything and set aside.
In a large bowl, whisk together the egg whites, maple syrup, oil, sugar, vanilla, and ground flax, until combined.
Add the oat and nut mix to the wet ingredients and stir to coat the dry ingredients with the syrupy mixture. I like to use a silicone spatula here.
Pour the granola mix onto the lined baking sheet and quickly spread the mixture throughout the pan.
Use the spatula to flatten the mixture into a single, thin layer. The granola should cover the entire surface of the sheet pan without any big gaps in the middle.
Bake the granola for 55 to 60 minutes, rotating the sheet pan after 30 minutes to ensure even baking. Let the granola cool completely. The cooling process is very important to getting the granola extra crunchy. Once cool, break the sheet of granola into clusters. For a snacking granola, break them up into large shards.
Store the ginger granola in an airtight container. It will stay crunchy for at least 2 to 3 weeks!