Preheat the oven to 325°F. In a large bowl, mix together the oats, ground flax seeds, and salt.
In a microwave-safe bowl or on the stovetop, melt together the peanut butter and honey. Add in the vanilla extract and stir to combine.
Pour the peanut butter mixture into the bowl with oats until well-combined and then press it onto a lined rimmed baking sheet using a rubber spatula.
Bake the granola for 25-28 minutes, gently flipping it halfway through. Let it cool completely before breaking the granola apart. Store in an airtight container for up to 1 month.
Notes
No peanut butter?➝cashew butter works well because it has a similar natural sweetness, but you can also use almond butter or any other type you have