Preheat your oven to 350°F (175°C) and lightly grease a donut pan.

In a mixing bowl, combine the whole wheat flour, peanut butter, yogurt, water, egg, and mashed banana. Mix well until a dough forms.

Spoon or pipe the mixture into the donut pan, filling each mold about 3/4 full.

Bake in the preheated oven for 10-12 minutes, or until a toothpick inserted comes out clean.

Remove the donuts from the oven and let them cool in the pan for 5 minutes, then transfer them to a wire rack to cool completely.

While the donuts cool, prepare the frosting by mixing the additional yogurt until smooth.

Once the donuts are fully cooled, use a piping bag or a ziplock bag with the corner cut off to frost the donuts with yogurt.

If desired, sprinkle with turkey bacon bits for a fun and savory touch!