1. Mix the ingredients for the taco seasoning together in a small bowl and set aside.
2. Add the olive oil to a large skillet over medium heat. Then add diced onion and sauté until translucent.
3. Add the ground beef and stir over medium heat for 6-8 minutes or until the meat is cooked through.  Drain if there is excess fat otherwise it will make the tortillas soggy. 
4. Add the taco seasoning and mix until the meat is evenly coated and the spices begin to become aromatic.  Add 1/4 cup of water, the diced tomatoes and corn. Simmer uncovered for for 8-10  minutes, frequently stirring so the filling doesn’t burn. Once the liquid has reduced and the tomato is no longer tangy, remove it from heat.
5. Preheat the oven to 350°F.
6. Place 4 tortillas on the bottom of a 9 x13″ baking dish. Add half the filling on top, then top with one cup of cheddar cheese. Layer the next 4 tortillas on top, followed by the rest of the filling. Top with the remaining cheddar cheese as well as the mozzarella cheese.
7. Cover with aluminum foil and bake center rack for 20-25 minutes.  Remove the foil and bake another 10 minutes or until the cheese is fully melted.

Serve with:

• Homemade Guacamole
• Simple Restaurant Salsa
• Easy Mexican Rice