Heat the oven to 375 degrees Fahrenheit. Slice the sweet potato in thin rounds. Line a baking sheet with foil or parchment paper. Place rounds on the baking sheet. Spray with a thin amount of olive oil if desired. Place in the oven to bake for about 15 minutes or desired doneness (you can check with a fork).

While the sweet potato chips are baking, divide the beef into four sections and press into patties (I use this handy tool here). Sprinkle with salt and pepper as desired. Place on a grill or grill pan on medium to medium-high heat. Slice onion and place on the grill pan to caramelize while the burgers cook. Let burgers cook for about 5 minutes per side (depends on desired doneness).

While the burgers cook, put shredded or chopped lettuce into a large bowl. Dress the lettuce with the lemon juice and olive oil. Divide into bowls. Slice tomatoes and any other vegetables you want on your burger (like avocadoes).

Once the burgers and sweet potatoes are done, make each bowl. Place a burger on top of the lettuce. Add some caramelized onion slices. Add a few slices of sweet potato next to the burger. Add tomatoes, avocado, pickles, sprouts and other veggie toppings. Drizzle with ketchup or mustard (I like Dijon) or BBQ sauce or leave plain. Enjoy!