At her age, she is ready to eat what you are eating and trying to sneak 20 gr of cauliflower in a muffin won't change her taste preference and soon or later you will get fed up of trying to hide.
Many toddlers who have eaten little vegetables or mainly from pouches will have a distorted taste when it comes to vegetables.
You are still in time to build a strong liking to vegetables but you need to make them the centre of the meal and prepare them in a tasty way.
Let her be part of all the process, from selecting the zucchini at the supermarket, washing it, and after you have thinly sliced it, brush it with olive oil , sprinkle the salt on top, and watch thought the oven door was it sizzles under the grill.
Kids can read our vibes and when we offer a food with the expectation they won't like it, they sense it.
Roast some pumpkin, and while prepping it, let her mix the content of the dish and rub oil, rosemary and garlic.
Have some peas on the kitchen counter and let her see you picking her one and eating it with pleasure.
Great some carrots, and let her sprinkle the chopped parsley on top, and hand her a spoon on top of which you will pour some olive oil, ...
You eat with all your senses, the noise of a knife chopping or a veggie sizzling in a pan, the smell of roasting veggies, the sight of the colour rainbow, and the touch of prepping it and the taste will only follow naturally
At the same time, while you work on the front of increasing her exposure to good tasting vegetables , you need to cut the competition of highly processed food if she has them even occasionally (baby crisps, puffed snacks, cereals bars , rice cakes, ...) as they alter both taste buds and gut bacteria (and these will send message to the brain for the food they want) .
Processed food, even chicken/vegetarian nuggets, completely alter the body response to food, so if you don't eliminate them, your attempts to change her preferences will not be very successful.