Prepare the Oven: Preheat the oven to 400°F and gather all the ingredients.
Prepare the Sweet Potatoes: Slice the sweet potatoes into rounds and arrange them on a baking sheet. Drizzle the rounds with avocado oil and season with salt.
Roast the Sweet Potatoes: Bake the sweet potato rounds for 35 minutes, or until they are lightly browned.
Form the Beef Patties: While the sweet potatoes bake, shape the ground beef into 1½-inch patties and season them with pepper and garlic powder.
Cook the Beef: Heat a pan over medium heat and cook the beef patties to the desired doneness.
Assemble the Sliders: Place the cooked beef patties on the roasted sweet potato rounds, then add guacamole, tomato, onion, ketchup, and mustard to complete the sliders.