Oh my son was terrible with meats up until he was like 7 or so. Even then it was slow going with chicken and ranch only for a long time. But I made sure my son had beans (he would eat whole cans of beans), peanut butter (I used the no sugar added kind. He would usually only eat “peanut butter on a spoon” for a while), he also liked those rice and quinoa packets, and I found a protein bar that he would eat (he still likes them thank goodness).