1. Heat a large skillet over high heat until hot. Add ground beef, garlic, and taco seasoning. Cook until beef is browned, breaking it into small pieces with the side of a spoon and mixing everything together.
2. While beef is browning, slice tortillas into 1-inch squares. A pizza cutter or scissors works well for this.
3. Add tomatoes, salsa, and cut-up tortillas to skillet and cook for 5 minutes over medium heat. If it seems dry, you can add a little water. Once this is heated through, sprinkle cheese over top and cover for a few minutes. Once cheese is melted, it is ready to serve. Sprinkle with chopped green pepper (if using) for a little color, crunch, and a healthy dose of vitamin C.
Note: Don't ask me why, but very often the price of the tortillas sold in the Hispanic foods section of a supermarket is lower than that of the tortillas sold in the refrigerator case of the very same supermarket. Check it out at your store.