Preheat oven to 275℉.
In a microwavable bowl, add ¼ cup peanut butter, ¼ cup honey, and1 teaspoon vanilla. Combine well and microwave until peanut butter is slightly melted and mix.
Pour the peanut butter mixture over 3 cups of oats. Combine well.
Spread the peanut butter oats evenly onto a baking sheet. Bake for 20 minutes.
Once baked, stir mixture and evenly pack it down in the baking sheet. Bake for approximately 10 more minutes.
Let the granola cool and place in refrigerator.