Begin to saute the onions in a large skillet with the oil. After 2-3 minutes, add the ground turkey and cook until the turkey is nicely browned.
1 tablespoon olive oil, 1 ½ pounds ground turkey, ½ cup onion
Clear a spot in the center of the pan and add the garlic. Cook for about 30 seconds until the garlic is fragrant, then stir into the turkey.
1 teaspoon garlic
Sprinkle on all the seasonings, and stir to mix in.
1 tablespoon chili powder, 2 teaspoons ground cumin, ¼ teaspoon dried oregano, ½ teaspoon salt, ¼ teaspoon black pepper
Add drained beans, and the tomatoes with the juices. Stir everything together and cook over medium heat for about 5 minutes until the juices have evaporated.
1 14.5 ounce can diced tomatoes, 1 15 ounce can black beans
Place a small amount of shredded cheese in the bottom of each taco shell. Set taco shells in an ungreased casserole dish. Place in a preheated 400° for 3-5 minutes until the cheese is melted. This adds a barrier to the shells and helps prevent them from becoming soggy once you add the turkey filling.
2 cups grated cheddar cheese, 12 hard shell taco shells
Scoop hot turkey filling into the taco shells. Top with shredded cheese. Return filled tacos to the oven for 7-10 minutes until the cheese is melted.
Serve hot with your favorite toppings.
Notes
Use regular hard taco shells or flat-bottomed shells. The flat-bottomed shells are easier to fill and stack in the pan, but they are usually a bit larger and there are fewer in the box.
You may end up with extra filling, depending on how full you fill your shells. Any extra filling can be refrigerated and reheated for a burrito or added to a taco salad.
Stacking the tacos upright in the casserole dish can be challenging. I start with one and lean it against the end of the casserole dish. Then the remaining shells are filled and lean onto the first one. I rearrange as I go and try to keep them as upright as possible.