I suggest you top the Mexican Beef and Rice Skillet with avocado, diced tomatoes, sliced black olives, shredded lettuce, chopped green onions, cilantro, sour cream, or guacamole. Sliced jalapenos (fresh or jarred), pickled onions, taco or hot sauce, or diced raw onion all would be additional great toppings to use. Feel free to mix it up or omit things you don't like. I also think crumbled or tortilla strips would be delicious on top too!