Preheat oven to 400 degrees.
Place cut sweet potato wedges in a large bowl and toss with 2 T. of olive oil, salt and pepper.
Spread sweet potatoes onto a baking sheet and begin to roast in the oven, roughly 20 minutes. Check on potatoes after 10 minutes and turn if needed.
While sweet potatoes are roasting, preheat a cast iron pan to medium high heat.
Form 4, 5-6 oz. patties and season with salt and pepper on both sides.
Sear patties in the heated cast iron pan for at least 4 minutes per side. Place 1 slice of cheese on top of each burger.
Finish cooking patties in the oven for another 5-8 minutes or until desired doneness. The cheese should melt in the oven.
Remove sweet potatoes and burgers from the oven and allow everything to cool for 3-5 minutes.
Assemble burgers with a toasted bun, lettuce, tomato and onion.
Enjoy burger, sweet potatoes and any other vegetable of choice.