Preheat the oven to 350°F. Line a 6-inch cake pan with parchment paper.
In a large mixing bowl, add the peanut butter, egg and coconut milk and whisk together.
Add the flour and baking powder. Fold together with a spatula until you have a smooth cake batter.
Transfer to the prepared baking pan and spread evenly.
Bake for 27 to 30 minutes, or until a toothpick inserted in the center comes out clean.
Allow to cool completely before adding the frosting.
Add peanut butter on top for "frosting".
Top with fresh blueberries!
Store leftovers in an airtight container in the fridge for up to 3 days.
Video
Notes
Tips
Make sure to use a dog safe peanut butter that is free of added sugars, flavors, and especially xylitol as that's incredibly toxic for dogs. Also, don't use crunchy peanut butter as dogs cannot digest whole nuts.
Use coconut milk that is also free of added sugars and flavors.
If you want to use organic oat milk, that will work as well. Just ensure it only has oats and water as the only ingredients.
Make sure to store in an airtight container in the fridge if you have leftovers.
Gluten Free — Replace the all purpose flour with 127 grams (¾ cup plus 1 tablespoon) gluten free flour blend.
High Altitude — Bake for 25 to 28 minutes or until a toothpick inserted in the center comes out clean.