Spices: onion powder, garlic powder, oregano, salt and pepper
Preheat the over to 400F.
Cut the sweet potato into circles or cubes and add it to a baking sheet, together with the red onion, cut into cubes. Drizzle olive oil, sprinkle all of the spices, and mix them nicely. Cook for 10-15 minutes.
Mix the lettuce salad with the chopped tomato. Add the black beans on top. Once the sweet potato is cooked, stir it in the salad.
Drizzle olive oil and balsamic vinegar and dig in.