Ingredients
Method
- Preheat oven to 350°F (175°C) and line a baking sheet with parchment.
- Whisk banana, peanut butter, brown sugar, egg, and vanilla until smooth.
- Stir in baking powder, salt, then fold in flour and optional oats or chips.
- Scoop tablespoonfuls onto sheet, flatten slightly to make sandwich bases.
- Bake 9–11 minutes until edges set; cool completely on a rack.
- Spread peanut butter between two cooled cookies to form sandwiches.