Preheat your oven to 375°F (190°C) and then line a baking sheet with parchment paper.
Combine all the ingredients i(mashed sweet potatoes, white beans, breadcrumbs, red onion, minced garlic, nutritional yeast, chopped parsley, lemon juice, salt, and pepper) in a large mixing bowl. Mix well until all the ingredients are evenly incorporated.
From the mixture make 4 to 6 balls, depending on your desired burger size. Then shape each portion into a patty and place them onto the prepared baking sheet.
Lightly brush or drizzle the patties with a little olive oil to help them crisp up during baking.
Bake the patties in the preheated oven for about 20-25 minutes, flipping them halfway through, until they are golden brown and cooked through.
While the patties are baking, you can toast the burger buns in a toaster or on a grill.
Once the patties are done, assemble your vegan sweet potato and white bean burgers with your favorite condiments and toppings.