You need to quit cooking "for" your picky eaters. You need to plan your menus based on what you want to serve for breakfast, lunch, and dinner. That is what is served. If your picky eater doesn't want to eat it, that is fine. Let them go hungry. And don't offer snacks inbetween, save their plate for those times they are crying and hungry between meals. It will be rough for a while but hang in there and stand firm (and make sure other adults in the house know what is going on and will support this.) After a period of time, your picky eater will be grateful to eat.
If your child is truly stubborn, you can also attach activities to their meals. Just let them know, "If you eat well at dinner and you don't fuss and cry over your food, then we will be able to *****." Then stand firm and NEVER give in and do ***** if they don't behave and eat at meals. Reward attempts. Praise in front of others. "She used to be so picky when she was eating but now she is bravely trying all sorts of new foods. I'm so proud of her!" etc.
I had one son who when he was 2&1/2 had to have a packed lunch one day a week when we were going to sibs piano lessons. It was a nightmare. No matter what I packed he would cry and not eat. There was a playground we passed on that day and I began to tell him that the day he ate his lunch we would stop and play. I cannot tell you how many times he would sit silently in the back of the van and cry while he ate his lunch because he wanted so badly to play at the park. Then one day he announced joyfully, "I ate it!" The tears part was over. (We did play at the park every day he ate his lunch, even during the period of time he cried the whole while he was eating.)
One other thing that will help this adjustment period...don't eat any fast food during this time. Serve healthy wholesome meals and forget the drive through exists. Stay firm...a hungry child will eat after a while. And they'll eat anything. So many parents are afraid to let their children go hungry. But it is an invaluable lesson. Hunger changes any and all eating habits.
VickiS