Love your revolving logo.
My bettas love chicken. Just make sure it doesn't have any sauce, herbs-spices and grease on it or you'll pollute the tank. And I wouldn't feed them chicken very often because they start to NOT eat their regular food (which usually has needed vitamins and minerals added). Also, most of the chicken being sold these days are fed hormones and antibiotics which you probably don't want your small betta body to get too much of. An occasional treat of cooked chicken is fine.
Other "meats" are beef heart (you can often buy it in frozen form at a good tropical fish store), worms, flies, brine shrimp, daphnia, mosquito larvae, bloodworms.