Vegan or regular mayonnaise
Sliced avocado
Sliced red onion
Lettuce
Toasted hamburger buns
Vegetable oil, for cooking
1 tsp. Ground cumin
1 tsp. Chili powder
2 tsp. Smoked paprika
2 cloves Garlic, chopped
1/4 cup Loosely packed cilantro or parsley leaves
1/2 Avocado, chopped
1/2 cup Old-fashioned oats
Freshly ground black pepper
Kosher salt
1 tbsp. Extra-virgin olive oil
1/2 Yellow onion, thinly sliced
1 package Shiitake mushrooms, roughly chopped
2 cans Black beans, drained and rinsed