K.P.
Hi K. I make a white sauce of butter, flour and milk and I most always put a little garlic powder in it. I also make another sauce nearly the same and I use butter, corn starch, and either water from cooking the potatoes, or just plain water.
I melt about two tablespoons of butter in a skillet, add the about two tablespoons of flour or corn starch. Make a smooth paste with the above and then add as much water or milk to make your sauce. I don't know what either wouldn't work with the ham, gr. beans and potatoes.
UMMMMMM!!!!
Good luck sometimes if your fire is to hot you will get lumps and they are NOT good.