The Best Vegan Enchiladas

Name: The Best Vegan Enchiladas
Prep time: 20 min
Cook time: 30 min
Total time: 50 min
Cuisine: Mexican
Ingredients: 3 tablespoons olive oil (or water for oil free); 3 tablespoons all purpose flour; 2 tablespoons chili powder; 1/2 teaspoon garlic powder; 1/2 teaspoon cumin; 1/2 teaspoon salt; 2 tablespoons tomato paste; 2 cups vegetable broth; 1 teaspoon apple cider vinegar; 2 cups riced cauliflower (1/2 medium head cauliflower); 4 ounces mushrooms; 1/2 cup raw walnuts; 2 tablespoons olive oil (or vegetable broth for oil free); 1 teaspoon cumin; 1 teaspoon smoked paprika; 1 teaspoon onion powder; 2 tablespoons low sodium soy sauce; 1/2 teaspoon salt, to taste; 1 (15-ounce) can black beans, drained and rinsed; 1/2 Recipe Vegan Nacho Cheese Sauce; 12-15 corn tortillas; 1/4 cup chopped cilantro; Vegan Sour Cream (for serving)