Fussy eaters

Help 😫 my almost 2 year old twins are such fussy eaters! They will not eat any chicken unless it’s nuggets, sauce on pasta is a big no go and so is any type of pie. They won’t eat tuna or peppers or beans/anything with the tomatoey sauce. One of them has just started eating sausages, burgers and plain mince but the other will only eat chicken nuggets maybe fish fingers if she’s in a good mood! I’m so lost with what to do, I’ve tried offering safe food with every meal but they still won’t touch anything else this has been going on for months. Does anyone have any dinner ideas for fussy eaters? I’m a vegetarian so a bit lost with meat meals, would love to not have to cook 3 different meals every night 😫