To get the biggest circles you can, slice the middle of the sweet potato crosswise into 4 x 3/4 inch thick buns.
Toast the sweet potato slices in a toaster. Depending on your toaster, it may take up to 4 toast cycles, so watch closely to make sure they don’t burn.
Add 6 oz of ground beef to a bowl, then add a 1/2 of tsp dried herbs mix, dash of salt, dash of black pepper, and 1/4 tsp of garlic powder, then mix together.
Add 1/2 avocado to a bowl then add a dash of black pepper, 1/4 tsp of garlic powder, and a dash of salt, then mash together with a fork.
Form the ground beef into 2 patties and pan fry over medium heat. Flip the burgers after 4-5 minutes, and heat until cooked throughly.
Add the 4 sweet potato buns to a plate, then add mustard to two of the sweet potato buns. Add the avocado mix to the other two sweet potato buns.
Add one burger patty on top of each sweet potato bun with the avocado mix, then top with baby spinach. Add the sweet potato buns with mustard on top to assemble the two burgers.