Preheat oven to 400 degrees F.
Slice the bell peppers in half. Spoon out the seeds and membranes. Place the peppers cut side up in a large baking dish.
Bake the peppers for 20 minutes until softened.
While the peppers are baking, prepare the taco meat. Place the ground beef into a medium size skillet, cook over medium heat while breaking up the meat.
Add in the garlic and cook an additional 30 seconds.
Mix in the salt, garlic and onion powders, cumin, chili powder, and oregano.
Stir in the Rotel and black beans until the entire mixture is combined.
When the bell peppers are done baking, if needed carefully drain out any excess moisture that accumulated in the bottom of them.
Spoon the cooked meat mixture into the peppers. Top with grated cheese.
Bake the stuffed peppers for 5 minutes until the cheese is fully melted.
Remove from the oven and serve with additional taco toppings as desired.