Preheat oven to 350°F (175°C) and line a baking sheet with parchment paper.
In a medium bowl, mash the bananas until mostly smooth. Stir in the maple syrup, oil, and vanilla until well combined.
2 medium ripe bananas, ¼ cup maple syrup, ¼ cup vegetable oil, 1 teaspoon vanilla extract
Add the oat flour, all-purpose flour, cocoa powder, and baking powder. (Optional, you can stir in 1/4 to 1/2 tsp of salt for enhanced flavor). Mix until a thick cookie dough forms. Fold in the chocolate chips.
1 cup oat flour, ½ cup all-purpose flour, ¼ cup cocoa powder, 1 teaspoon baking powder, ½ cup semi-sweet chocolate chips
Scoop about 2 tablespoons of dough per cookie onto the baking sheet. Flatten slightly with the back of a spoon (they won’t spread much).
Bake for 12–14 minutes, until set around the edges but still soft in the center.
Let cool on the pan for 5 minutes, then transfer to a wire rack.
Store in an airtight container in the fridge for up to 5 days, or freeze for up to 2 months.