Preheat the oven to 400°F (200°C).
Peel the sweet potatoes and cut them into small, evenly sized cubes.
Place the sweet potatoes in a large bowl. Toss with avocado oil, garlic powder, salt, and black pepper until evenly coated.
Spread the sweet potatoes in a single layer on a baking sheet. Roast for 30–40 minutes, stirring halfway through, until tender inside and lightly browned around the edges.
While the sweet potatoes roast, heat a skillet over medium heat. Add the lean ground beef and cook for about 8 minutes, breaking it apart with a spatula, until browned and fully cooked.
Stir the Worcestershire sauce into the beef and season with additional garlic powder, salt, or black pepper if desired.
Prepare the toppings by shredding the lettuce, slicing the red onion and pickles, and dicing the tomatoes.
To assemble the sweet potato burger bowl, start with a layer of shredded lettuce, then add roasted sweet potatoes and seasoned ground beef.
Finish with tomatoes, red onion, pickles, and any additional burger-inspired toppings you enjoy.
Serve immediately while the sweet potatoes and beef are warm.