Dealing with a very fussy 4 year old

My 4 year old little boy is a very picky eater. I know this is normal, but he is getting worse with eating. He will only eat chicken nuggets, fish fingers, cheese and tomato pizza, chips, cream crackers, sausage rolls, plain pasta, and jam and choc spread sandwiches. He won’t touch cheese unless it’s pizza, and he is refusing to try anything new. He never goes for any fruit or veg which worries me. I’m worried he will end up with a very restricted diet and only eat 3 things. He is eating jacket potatoes with beans and pasta bake at nursery, but not at home. I even asked the nursery what was in their pasta bake so I could try and copy it but he still wouldn’t eat it at home. To be honest, I think it’s a control thing. Are there any ways I can get him to eat fruits and vegetables and a larger variety of foods?