Yeah, the zucchini chocolate muffins @janac22 mentioned... it's part of this whole quiet hack I see everywhere now. Like how everyone makes pizza with a cauliflower crust or uses black beans in brownies. It's not just for kids, it's like we're all tricking ourselves into eating better... and it kinda works.
You know what, I used to be against hiding veggies. I thought kids should just learn to eat them plain. But my niece would not touch anything green. I started blending spinach into her morning fruit smoothie, and she drinks the whole thing. Now I even bake zucchini into chocolate muffins. Sometimes you just gotta get creative.