Preheat oven to 400°F. Spray a 13 x 9-inch casserole dish with nonstick spray.
Place taco shells standing up in the baking dish.
Preheat olive oil in a skillet over medium heat. Add ground chicken and onion. Cook until chicken is done and onion is tender, about 8 to 10 minutes. Remove any excess grease and liquids.
Add taco seasoning mix, drained diced tomatoes, and olives to the skillet. Stir to combine with the chicken. Continue to cook 5 minutes, stirring frequently.
While the taco meat is cooking, place the shells in the oven and bake for 5 minutes to warm and crisp.
Remove the shells from the oven and fill each one with the chicken taco meat mixture, dividing evenly between each of the shells. Top with shredded cheese.
Bake for 5 to 10 minutes or until the cheese is melted and the shells are turning golden brown.
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VARIATIONS: Use ground beef or turkey. Use any favorite cheese. Substitute soft taco shells and wrap the meat mixture with a little cheese, place in casserole dish, top with cheese and bake about 20 minutes or until tacos are heated through and cheese is melted.
SERVING SUGGESTIONS: Top with your favorite taco fillings such as shredded lettuce, sliced green onion, fresh diced tomato, avocado slices, sour cream, salsa, and fresh cilantro.