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Spent Grain (Oatmeal) Peanut Butter Dog Biscuits

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  • Author: Jasmine Briones / Sweet Simple Vegan


  • 4 cups spent grain (dried) OR 4 cups rolled oats
  • 2 cups whole wheat flour
  • 1 cup unsalted creamy peanut butter
  • 1/4 cup mashed sweet potato
  • 2 flax eggs*


  1. *Flax Eggs: Mix 2 tbsp flax seed meal with 6 tbsp water, and let it sit for about 10 minutes to fully thicken.
  2. Preheat your oven to 350 F.
  3. In a large bowl, combine your flax eggs, peanut butter, and sweet potato until thoroughly combined.
  4. Slowly add in the flour, and mix until it is uniform before adding in your spent grain or oats.
  5. Roll out the dough onto a floured surface to about 1/4″ and cut out shapes with cookie cutters. You won’t get clean edges, so you can smooth the edges out with your fingers and some water if desired.
  6. Line the cookies up on baking sheets. The cookies don’t expand, so you can bake them fairly close together.
  7. Bake in oven at 350 F for 30 minutes, then reduce temperature to 225 F and continue baking the cookies for 2 hours.
  8. Remove from the oven, cool, and share with your little friends!


Adapted from 17 Apart
The dried cookies will keep for 2 weeks in an airtight container and you can even freeze them in ziploc bags.