Preheat oven to 175°C (350°F).
Mash the 2 large bananas in a shallow bowl. Add the 1 3/4 cups quick oats and mix well to combine. Fold in any optional add-ins you like (for example, 4 tablespoons peanut flour, 1/4 cup chocolate chips and 2 teaspoons honey).
Line a baking tray or sheet with baking/parchment paper. Drop one tablespoon of cookie dough per cookie onto the tray, then press down with the back of a metal spoon and shape into cookies (these will not spread like normal cookies).
Bake for 15-20 minutes, or until the cookies are lightly golden on top and just set to the touch. Keep an eye on them after 10 minutes, as they can bake faster depending on how hot your oven is before baking.
Remove from the oven and allow cookies to cool on a wire rack.