In a large skillet begin to brown the ground beef, breaking it up into bite-size pieces. Add in the diced onion and bell pepper. Cook until the beef is brown and no longer pink (about 10 minutes on medium-high heat).
Preheat the oven to 350 degrees Fahrenheit.
Add the rinsed and drained red beans to the skillet, tomato sauce, diced green chiles and taco seasoning. Mix well and cook on low for 5 minutes.
While the taco meat is simmering begin to heat up the taco shells. Unwrap taco shells, place on a cook sheet pulling apart the taco shells slightly. Bake at 350 degrees Fahrenheit for 5 minutes until crisp and golden brown.
Once taco shells are done carefully scoop in taco meat and top with a generous portion of Mexican cheese. Eat as is or enjoy with additional toppings like shredded lettuce, salsa, slice olives and/or guacamole.