01 - Set the oven to 375°F (190°C) to preheat.
02 - Slice the tops off the bell peppers and remove seeds and membranes; place aside.
03 - Heat olive oil in a large skillet over medium heat, then add onion and garlic; cook for 2 to 3 minutes until softened.
04 - Add ground turkey to the skillet and cook, breaking it up with a spoon, until browned and fully cooked, about 6 to 8 minutes.
05 - Stir in diced tomatoes, cooked rice, oregano, paprika, salt, and black pepper; cook for 2 to 3 minutes to meld flavors. Remove from heat and fold in chopped parsley.
06 - Fill each bell pepper with the turkey and rice mixture and place them upright in a baking dish.
07 - Optional: sprinkle shredded cheese evenly over the stuffed peppers.
08 - Pour 1/4 cup water into the bottom of the baking dish to maintain moisture, then cover loosely with foil.
09 - Bake covered for 30 minutes until peppers begin to soften.
10 - Remove foil and bake an additional 10 minutes until peppers are tender and cheese is golden and melted.
11 - Sprinkle extra chopped parsley over the peppers before serving.