Preheat the oven to 325 and line a baking sheet with parchment paper.

In a large bowl, combine two of the eggs, the peanut butter, pumpkin, garbanzo bean flour (or wheat flour), and oatmeal. Stir until a dough forms. Add more garbanzo bean flour or some all-purpose flour to the dough if needed.

Sprinkle some all-purpose flour onto a clean surface and add the dough. It will be kind of sticky, so use the flour to coat the outside of the dough as you roll it to about 1/2-inch thick. Use a cookie cutter to cut shapes and place them gently onto the baking sheet.

Combine the remaining dough, roll, and repeat.

Make the egg wash by whisking the remaining egg and 1 tablespoon water in a small bowl. Use a pastry brush to paint the egg wash onto the top of each dog treat.

Place in the oven and bake about 30 minutes, until hard. Let cool completely before storing at room temperature or in the fridge in a sealed container.