Kaelyn also went through a week or two of the same and what i found helped tremendously was introducing the mighty spork
at first i gave it to her with oatess or some other edible dry cereal... and she would try eat like mommy and daddy... or give it to them in a muffin tray and let them move it from hole to hole...
then we graduated to real food and now i let her grab the spoon, then help her load it up and with as little guidance as possible but still holding the back of it let her get it to her mouth...
distraction works too... let them eat while watching the dogs play or ... i don't know the tv if need be (you could always break the habbit later i guess)
and if they want to eat only the cheese on the samwich make it a toased cheese... then they have to eat them together...
good luck