Mushroom Black Bean Veggie Burger - The Foodie Dietitian

Ingredients

• 1 lb. shiitake mushrooms, stemmed and sliced
• 3 tablespoons olive oil, divided
• Salt
• pepper
• 1 can black beans, rinsed and drained
• 1 medium onion, diced
• 2 cloves garlic, minced
• 1/2 cup walnuts
• 1 tablespoon quinoa flakes
• 1/4 cup brown rice
• 1 egg yolk
• 1 tablespoon white miso
• 1/4 cup plain Greek yogurt
• 1 teaspoon chipotle powder
• 1 teaspoon chili powder
• 1/2 teaspoon cumin
• 6-8 Hamburger buns, toasted
• Toppings: Cheddar cheese, lettuce, tomato, pickles
• 1/3 cup Greek yogurt
• 2 tablespoons ketchup
• 2 tablespoons relish
• 2 teaspoons mustard
• 1 teaspoon sriracha