Chili with Beans (easy dump recipe)

the basic chili with beans mixture–not  real pretty, but tasty! (serves 4 at least) ½ C diced onion (1 small onion) 1 lb ground beef  1 can S&W black chili beans–do NOT drain (If you cannot find this, use regular black beans and add 1 T pico de gallo spice) 2 cans Rotel chopped tomatoes…