Try vegetables that aren't too strongly bitter (like green beans, roasted carrots, cauliflower, sweet potato), roast or steam them so they're soft, and melt cheese on them. In my experience, if a little kid sees cheese, they go for it, no questions asked. And you can cut meat into easy-grab little strips or chunks so it's not intimidating. We also make fried chicken tenders by coating the chicken in egg and then almond flour, and pan-frying them in coconut oil.
I think a lot of kids' pickyness stems from feeling frustrated with being unable to cut up/chew food very well, and also from food being too bitter. I'd never try to feed my 2-year-old niece pepper, for instance. Also, my niece loves to help prepare the food, and if she helps make it she's more enthusiastic about eating it.
Cottage cheese seems to be a big winner. She'll eat it no matter what it's with. She loves yogurt and berries, primal soups, sweet potato, and eggs. It's easy to include green vegetables if you chop them very fine and put them in those egg muffins. An egg muffin, some sweet potato, and a couple slices of cheese would be an awesome dinner in my niece's eyes.