Okay, this one sounds weird, but hear me out. Grate a potato or a zucchini and squeeze out the water.
Use it to bind veggie burgers or meatloaf. It adds moisture and sneaks in vegetables for picky eaters.
I once tricked my nephew into eating zucchini this way. He said, "Auntie, these meatballs are juicy." I never told him the truth.