Pre-heat oven to 300 degrees. Line a baking sheet with SILPAT or parchment paper and set aside.
Mix the oats, collagen, cinnamon, and salt until evenly combined.
Add peanut butter, honey, and coconut oil to a small microwave safe bowl. Microwave for 30-45 seconds or until melted. Add vanilla extract and whisk until combined.
Pour peanut butter mixture over dry ingredients and mix until you no longer see any powder and the oats are all coated.
Spread granola mixture onto the lined baking sheet. It's okay to leave some chunks (not too big) so that you will end up with bigger chunks of granola.
Bake for 10 minutes, then remove from the oven and toss the granola with a spatula. If adding coconut into the mixture, do it here. Return baking sheet to the oven for another 4-5 minutes. (Note: the granola should still look soft when you take it out of the oven!)
Allow the baking sheet with granola to cool (on top of the hot oven if possible) for 20-30 minutes before serving or storing. It will crisp up during this time.