Preheat the oven to 350°F.

Mash the banana(s) using a fork or masher.

Using an electric mixer, beat together the peanut butter, brown sugar, and mashed banana.

Add the egg and vanilla extract and continue to mix until well combined.

In a small mixing bowl, whisk together the flour, oats, baking soda, and salt. Slowly add to the mixer and combine with the wet ingredients.

Use a cookie scoop to form rounded balls and place on a parchment lined baking sheet.

Bake for 10-12 minutes or until golden brown.

Let cool before serving. These keep well for a couple of days in an airtight container.