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Preheat your oven to 350 degrees.
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Steam your sweet potatoes, kale, apple and zucchini so they are nice and soft. I put mine in the microwave for about 5 minutes and they were all tender.
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In a food processor, grind your oats into a powder.
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Add all the other ingredients (potatoes, kale, apple, zucchini, backing powder and greek yogurt).
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Combine until a dough forms.
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Roll out your dough on a piece of parchment paper. The dough was kind of hard to work with because it's very sticky. I just kept pressing it down until it was thin enough to make the biscuit. I then used the cookie cutter and moved the bones to a cookie sheet that was sprayed with cooking spray.
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Cook for 10-20 minutes depending how you like them. You will need to keep these refrigerated so they may not stay crisp.I kept mine a bit chewy but I think if you want the crispier you can bake them longer or turn off the oven and let them sit in there until it cools down.