Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper.

In a mixing bowl, combine the mashed banana and peanut butter until smooth.

Add the egg and olive oil, mixing well until fully incorporated.

Gradually stir in the whole wheat flour and rolled oats until a dough forms.

If the dough is too dry, add water a tablespoon at a time until it reaches a workable consistency.

Lightly flour your countertop and roll out the dough to about 1/4-inch thick.

Use cookie cutters to cut out shapes or simply cut the dough into squares with a knife.

Place the cut treats on the prepared baking sheet, spacing them about an inch apart.

Bake in the preheated oven for 15-20 minutes or until the edges are golden brown.

Remove from the oven and allow to cool completely on a wire rack before serving.