Preheat oven to 325 degrees F. Line a large baking sheet with a Silpat baking mat or parchment paper. Set aside.

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

In a medium saucepan, melt the coconut oil over medium heat. Add the peanut butter and honey and stir until melted and combined. Remove from heat and whisk in the vanilla and mashed banana. Whisk until smooth. You will have a few little chunks from the banana. 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. Store in an airtight container or glass jar with a lid for up to two weeks.