The easiest way to add flavor to green beans is by adding a spice like onion powder, minced onion flakes, garlic powder, seasoning salt or even chili powder. However, you should not add all of these seasonings in one pot, but they are all suggestions. I also love to add either bacon that I'll crisp up in the pot prior to cooking or bacon fat. Another great option is adding diced ham to the pot of green beans. Depending on the flavors of the ham the green beans will take on additional flavor from the ham.