Preheat oven to 350°F / 177°C / Gas Mark 4

Peel, seed and chop butternut squash. Place on baking sheet, cover with foil and roast for 30 - 40 minutes until very tender. Set aside to cool to room temp.

In a medium mixing bowl - whisk eggs, then add banana and cooked butternut squash.

Using a potato masher, break up banana and squash until mixture is uniform, with no large pieces remaining.

Sprinkle in whole wheat flour and stir to combine. Use your hands to incorporate remaining flour and form dough into a ball. (Wrap in plastic and refrigerate for 30 minutes if necessary)

Flour your work surface and a rolling pin. Roll dough out to 1/8" thickness. Use 2 inch cookie cutter to cut shapes out of dough.

Place treats on parchment-lined baking sheet and bake for 18 - 20 minutes.

Cool completely before giving to your dog.