Preheat the oven to 300 degrees. Line a baking sheet with parchment and set aside.
In a mixing bowl, stir together the flour, oats, milk and salt. Add the eggs and peanut butter, stirring well to blend. Add the water, stirring until the dough comes together. Roll into 1-inch balls and place on the parchment, then flatten with the bottom of a glass. Bake for 40 minutes or until the biscuits are golden brown. Allow to cool for 10 minutes on the baking sheet, then transfer to wire racks to cool completely. Store in an airtight container or freeze for longer storage.
Recipe by The Tennessee Magazine at https://www.tnmagazine.org/cooking-for-the-dog-days-of-summer/