Heat the oil in a small skillet over medium heat. Add the onion & dry seasonings and cook down for 2 minutes. Add in the black beans and cook for another 2 minutes. Turn heat to low. Right before serving add the cilantro and lime juice.
Combine all of the avocado salsa ingredients in a bowl and set aside.
Add the refried beans to a pot with a little water to loosen it up. Warm over medium heat until smooth and hot. Lower heat until ready to serve.
Warm the tostada shells in the oven. To assemble, spread some refried beans on a tostada shell and top with black beans, avocado salsa, vegan parmesan and yogurt. Repeat with the remaining ingredients and serve with lime wedges on the side.
Calories: 243kcal, Carbohydrates: 30g, Protein: 6g, Fat: 12g, Saturated Fat: 2g, Polyunsaturated Fat: 2g, Monounsaturated Fat: 7g, Trans Fat: 0.03g, Sodium: 640mg, Potassium: 368mg, Fiber: 8g, Sugar: 3g, Iron: 2mg