Preheat the oven to 350°F and line a baking sheet with parchment paper.
To a large bowl, add the 3 large bananas and mash them with a fork. Add the 1/2 cup peanut butter together with the 1 teaspoon vanilla extract and mix well.
To a blender, add 2 cups gluten-free rolled oats. Blend for 8-10 seconds, just until coarsely ground.
Add the oats over the banana mixture and mix well to combine. Fold in the ½ cup raisins.
Using a cookie scoop, add a spoonful of mixture into the prepared sheet pan. Flatten them into 1/2-inch disks.
Bake for 12-15 minutes, or until golden brown.
Video
Notes
Use ripe bananas
best to use rolled oats instead of quick oats
Peanut butter: better to use all-natural peanut butter. Any other nut butter will work. Another great option is almond butter.
Allow cookies to cool on a rack before eating
place leftovers covered on your counter for up to 3 days. store in the fridge in an airtight container for up to 10 days.