Preheat oven to 300 degrees. Line large baking sheet with parchment paper. In a medium bowl, combine the oats, nuts, quinoa, cinnamon, and salt.
In a separate bowl, whisk together the coconut oil and maple syrup. Pour the wet ingredients over the dry ingredients and stir until well combined.
Spread the oat mixture on the prepared baking sheet in an even layer. Use the bottom of a glass to gently press the mixture to pack it down.
Bake for 40-45 minutes. Cool for 30 minutes before breaking into pieces. Store in an airtight container for up to 2 weeks.
Serve with plain Greek yogurt or milk if desired.