Place a deep 12-inch skillet over MEDIUM-HIGH heat. Add ground beef and cook, stirring to break it up, until browned and crumbly, about 5 minutes. Drain or blot excess grease if necessary. Add the bell pepper, onion, and garlic. Cook, stirring occasionally for 3 to 4 minutes, until the onion and bell pepper have softened slightly. Add the uncooked rice, Rotel tomatoes, tomato sauce, and taco seasoning mix and stir to combine well. Stir in the broth and bring the mixture to a boil. Reduce the heat to low, cover, and simmer for 25 minutes.