01 - Set oven temperature to 375°F (190°C).
02 - Slice tops off the bell peppers and reserve. Remove seeds and membranes. Use a sharp paring knife to carve jack-o'-lantern faces on one side of each pepper.
03 - Heat olive oil in a large skillet over medium heat. Add chopped onion and sauté for approximately 3 minutes until softened.
04 - Add minced garlic and cook for 1 minute, stirring until fragrant.
05 - Add ground beef or turkey and cook, breaking up the meat with a spoon, until browned and fully cooked, about 5 to 7 minutes. Drain excess fat if needed.
06 - Stir in cooked rice, diced tomatoes, tomato paste, oregano, smoked paprika, salt, black pepper, and parsley if using. Continue cooking 2 to 3 minutes until heated through.
07 - Remove skillet from heat and stir in 1/2 cup shredded cheddar cheese until melted and evenly distributed.
08 - Stuff each prepared bell pepper with the filling, pressing lightly to pack. Place upright in a baking dish.
09 - Sprinkle remaining cheddar cheese over the top of each filled pepper. Place reserved pepper tops back on.
10 - Pour about 1/4 cup water into the bottom of the baking dish to create steam.
11 - Cover dish with foil and bake for 30 minutes.
12 - Remove foil and bake for an additional 10 minutes, until peppers are tender and cheese is bubbly.
13 - Allow peppers to cool slightly before serving.