Preheat oven to 400 degrees F.
Dice all vegetables; partially soften carrots by microwaving for 5-6 minutes.
In a large mixing bowl, add quick oats, cornflakes or bread crumbs, nutritional yeast flakes, salt and seasonings. Mix together.
In a small bowl or mug, mix the ground flaxseed with 3-4 tablespoons of hot water. Stir until the mixture forms a gel. This should only take a few minutes.
Add the crushed tomatoes, diced vegetables, ground nuts and flaxseed mixture to the bowl. Mix well. If more moisture is needed to form a thick batter, add additional crushed tomato.
Form the batter into individual burgers. To form the patties, simply form a chunk of the batter into a ball, place it on the flat surface of the pan, and then pat it out flat. They should spread out in a circular shape. You'll want them to be not too thick and not too thin.
Add burgers to a baking sheet that is lined with parchment paper or use a silicone baking sheet (my preferred method). Both ways are excellent options. No oil is needed for baking--that means less calories for you and more benefits for reducing inflammation and improving heart health.
Bake for 15 minutes until top of burger is browned. Flip and bake for 10-12 more minutes. If you like your burgers to be on the crunchy side, feel free to bake a little longer. Serve immediately for a delicious lunch or dinner.