Preheat the oven to 350F.
In a large bowl, mash the bananas with a fork until it has a baby food consistency. Add the peanut butter and the egg and mix thoroughly.
Add the flours and stir in until fully combined. Gently oil your hands and a clean surface. Knead the dough until it’s not sticky.
Roll out the dough with a lightly oiled rolling pin until about a ¼ of an inch thick.
Stamp out the treats with your preferred cookie cutter, re-kneading and re-rolling with scraps. Place the treats on a parchment lined baking sheet, with an inch between each treat. If you make differently sized treats, bake them on separate baking sheets, because they’ll take different times to bake.
Bake the treats in the preheated oven for 12-15 minutes, depending on the size of the treats (12 for for small, 15 for larger treats!). They should be a little brown at the edges after baked. If they're not, bake them a bit longer, checking often. Let the treats cool for 5 minutes on the sheet pan before transferring to a cooling rack to fully cool.
I hope your doggo loves these like mine does! These freeze amazingly for long term keeping. Let me know what you think below in the comments or on Instagram @higheralchemybaking!