Combine all ingredients, excluding sweet potato, into a large bowl and mix together.
Form the mixture into patties.
Heat oil in a pan on medium until hot- but not smoking.
Place burger patties in pan and let cook for about 5-8 minutes either side. (you can cover the pan with a lid to speed up cooking time)
Slice sweet potato into 1/2 inch thick rounds and place on parchment covered backing sheet
Spray sweet potato lightly with avocado oil and BROIL in the oven- use the second rack, on high heat (525 degrees F)
Broil potatoes for about 6-8 minutes on either side, or until they start to turn golden and bubble.
Form burgers with sweet potato rounds, mixed greens, avocado, and condiments. Enjoy!