Preheat the oven to 350°F (175°C).
Wash and dry the bell peppers. Slice each pepper in half horizontally and remove the seeds and stems, creating six pepper halves.
Arrange the peppers in a 9×13-inch baking dish.
Brush with ½ tablespoon olive oil and season with salt and black pepper.
Bake for 20 minutes until they begin to soften.
Meanwhile, heat the remaining tablespoon of olive oil in a large skillet over medium heat.
Add the ground turkey and cook until browned, breaking it into small pieces.
Stir in the taco seasoning and water until evenly combined.
Add the salsa and black beans, then simmer for 2 minutes.
Remove the skillet from the heat.
Fill each roasted pepper generously with the turkey mixture.
Sprinkle shredded Mexican cheese evenly over each pepper.
Cover the baking dish loosely with tented aluminum foil and bake for 15 minutes.
Remove the foil and bake for another 5 minutes, or broil for 2–3 minutes until the cheese is melted and lightly golden.
Garnish the Taco Stuffed Bell Peppers with chopped cilantro before serving.