Preheat your oven to 325°F (160°C).
Line a baking sheet with parchment paper.
In a large mixing bowl, combine the rolled oats, cooked quinoa, toasted almonds, ground flaxseed, salt, and cinnamon. Stir until evenly distributed.
In a small saucepan over medium heat, melt the unsalted butter until it turns golden brown and smells nutty.
Remove from heat and stir in the honey and vanilla extract.
Pour the brown butter mixture over the dry ingredients and stir until evenly coated.
Spread the mixture onto the prepared baking sheet. Bake for 25-30 minutes, stirring halfway through.
After baking, let it cool for 10 minutes and then sprinkle dark chocolate chips over the warm granola.
Let the granola cool completely before breaking it into clusters and storing in an airtight container.