Start by draining and rinsing the canned beans. You want to remove any excess liquid that could make the burger too mushy. If you're using a food processor, add the beans and pulse them until you reach your desired texture—either chunky or smooth, depending on your preference.
In a large bowl, combine the mashed beans with the tomato paste, salt, garlic powder, onion powder, and the cooked diced vegetables. Mix everything well to ensure that the flavors meld together.
Next, add the flour or oat bran to the mixture. Stir until everything is well combined. If the mixture feels too soft, add a little more flour until it can hold its shape when formed into patties.
Now, it's time to shape the mixture into patties. I usually make them about the size of my palm. This ensures they cook evenly. Place them on a parchment-lined baking sheet or plate while you prepare to cook.
For cooking, you have several options: you can pan-fry, grill, or bake them. If you're frying, heat a little oil in a skillet over medium heat. Place the patties in the skillet, making sure not to overcrowd. Cook for about 4 to 5 minutes on each side, or until they are golden brown and crispy.
If you prefer baking, preheat your oven to 350°F (175°C). Arrange the patties on a parchment-lined baking sheet and bake for 10 minutes. Flip them over, then return to the oven for another 10 minutes or until they reach your desired texture.
For grilling, place them on a preheated grill and cook for about 5 to 7 minutes per side, making sure to use a gentle touch when flipping to keep them intact.
Once they’re cooked, remove them from the heat and let them sit for a couple of minutes. This helps them firm up even more.
Finally, serve your Veggie Burgers with your favorite toppings! Whether it's lettuce, tomato, avocado, or a special sauce, the choice is yours!