Preheat oven to 350 degrees F. Line a large baking sheet with a Silpat baking mat or parchment paper. Set aside.

In a large bowl, combine oats, walnuts, salt, and cinnamon. Stir to combine.

In a medium bowl, combined mashed banana, coconut oil, maple syrup, brown sugar, and vanilla extract. Pour liquid mixture over oat mixture and stir until oats are coated. Spread evenly on prepared baking sheet.

Bake granola for 25-30 minutes, stirring occasionally. Remove from oven and cool granola completely on baking sheet. The granola will crisp up as it cools. When granola is completely cooled, stir in the chocolate chips, if using. Store in an airtight container or glass jar with a lid for up to two weeks.

Note-for vegan recipe, make sure you use vegan chocolate chips.