Preheat your oven to 300F (150C). Line a baking sheet with parchment paper.
Add the oats to a food processor and grind until they reach a fine powder.
Add the bananas and peanut butter and blend until a sticky dough is formed.
Remove from the food processor and roll out on a lightly floured surface.
Cut out the treats using a cookie cutter or knife.
Lay the treats on the prepared baking sheet and bake for 25 to 30 minutes, until the treats are puffed up a bit, dry and dark brown on the bottoms.
Let cool before giving one to your pup.
Store in an air-tight container at room temperature for up to 1 week, in the fridge for up to 2 weeks, or in the freezer.