Preheat oven to 350F and spray a mini muffin tray with coconut oil.
In a large mixing bowl, whisk together mashed banana, pumpkin, egg, and coconut oil.
Stir in flour, rolled oats, baking soda, and baking powder and stir until just combined.
Split batter evenly between 24 mini muffins and move to the oven to bake at 350F for 12-14 minutes, or until a toothpick inserted comes out clean. Let cool to room temperature before frosting.
In a medium bowl, use a hand blender to beat room temperature cream cheese for ~1 minute or until softened.
Add greek yogurt and maple syrup (if using), and beat for another 1 minute until combined.
Pipe frosting on top of cooled pupcakes. Alliteratively, use a spatula to add a little bit to the top of each - I promise your dog won't taste the difference!
