For this snack, it is better to bake vegetables, so they will be less watery and more delicious. And this will improve the final taste, and in addition, it will give natural color transitions to all kinds of toasts. I do this in advance, in the evening I put the vegetables to bake, and then leave them in the oven to cool down until the morning.
By the way, carrots are better to take a bright color, if possible.