I sneak in spinach & kale in everything. I cut it up to tiny and say its seasoning.
In spaghetti sauce, I make a carrot & squash puree and mix it in with pasta as well. In macaroni & cheese, I make a homemade cheese sauce with squash puree as well. they dont know the difference and its orangey color. lol
I try to make muffins and put veggies in it along with fruits.
Cakes as well, I cheat and use box cakes sometimes but instead of following the instructions, I use a cans of pumpkin and thats it and the cake comes out just like it didnt have it in it. Of course this only works on chocolate cakes or dark cakes no white because the color wouldnt be white. lol
If I make a soup & casseroles, they eat all the veggies because they cant taste.
In sandwich, I try to give them lettuce and tomato on a hoagie chopped off small along with everything.
Quesadillas are easy mix chicken with veggies and lots of cheese.