1 sleeve saltine crackers
3 tablespoons butter
Veggies: You can use just about any veggies you have one hand - fresh, canned or frozen. Fresh will need to be steamed or cook the casserole longer at 350. I find that frozen end up with the best texture but I have used all depending on what was in the pantry.
My almost 3 year old smashing the saltines for me - he had a blast!