Preheat oven to 300 degrees Fahrenheit.
Roughly chop 1 cup of unsalted dry-roasted peanuts. (See notes below regarding peanuts.)
In a medium mixing bowl, stir together chopped peanuts with oats.
Add peanut butter, maple syrup, oil, vanilla, and salt to your mixing bowl, and stir until well-combined.
Line 2 baking sheet pans with parchment paper or silicone liners.
Spread granola mixture evenly across both baking sheet pans.
Bake granola for 15 minutes, then rotate baking sheets (from upper to lower oven racks to promote more even baking), before returning to oven to bake for another 15 minutes. Bake for a total of 30-34 minutes, or until the edges of granola are just starting to turn a golden brown.
Allow granola to cool completely before stirring or removing it from baking sheet pans.
Store in an airtight container for up to 2 weeks at room temperature.