

Preheat oven to 350F (180C). Line baking sheets with parchment paper.
Combine evaporated milk and vinegar in a medium bowl. Stir well (mixture will thicken).
Add bananas and baking soda to the evaporated milk mixture. Next, whisk egg, brown sugar, oil and vanilla in a separate large bowl. Stir in flour and baking powder.
Add banana mixture and stir until mixture is well combined.
Add chocolate chips if using.
Drop 2 tbsp (30mL) dough on prepared baking sheets, about 2 (5cm) apart.
Place banana chip on top of each cookie.
Bake in preheated oven 13 to 15 minutes until the edges are lightly browned. Cool cookies on baking sheets for 5 minutes.
Transfer cookies to cooling rack. Store cookies loosely covered or in the freezer.