There are a few tricks to keep veggie burgers from falling apart when you grill them. #1: Add A Binder: The main way to make sure your veggie burger sticks together is to add a binder - something that holds all of the ingredients together to keep your burger patty from crumbling. Ingredients like flax eggs, regular eggs, breadcrumbs, oats, rice, all work. I like combining something moist (flax egg or regular egg) with a grain (oat flour, cooked rice, etc) for the perfect binder. #2: Remove Extra Water: You need some moisture in your burger, but not too much! A too-wet burger patty won't grill up well and will fall apart. If you're adding veggies into your patty mixture, choose sturdier veggies that don't have as much water (e.g. carrots, sweet potatoes). Veggies like zucchini or eggplant won't work as well. #3: Make Sure Your Burger Patties are 1 Inch Thick: This will also help them hold together! If your patties are too thin, they will fall apart when you try to flip them during cooking.