Beef Enchiladas with a Homemade Mexican Enchilada Sauce

Name: Beef Enchiladas with a Homemade Mexican Enchilada Sauce
Ingredients: For the Enchilada Sauce; 2 tablespoons Vegetable or canola oil; 2 tablespoons flour; 4 tablespoons chili powder (you can use less for less heat); 1/2 teaspoon garlic powder; 1/2 teaspoon salt; 1/4 teaspoon cumin; 1/4 teaspoon oregano; 1/8 teaspoon cayenne pepper; 2 cups vegetable stock (or chicken stock); For the Enchiladas; 2 tablespoons vegetable oil; 1 yellow onion, diced; 2 cloves of garlic, minced; 1 1/2 pounds ground beef; Pinch salt and pepper, to taste; 4 ounces can of diced green chiles; 15.5 ounces can of black beans, drained and rinsed thoroughly; 8 to 10 flour tortillas; 3 cups Mexican-blend shredded cheese; 1 batch of homemade enchilada sauce (a can of store bought sauce can be substituted; 1 handful chopped fresh cilantro and green onions, for garnish