Preheat your oven to 200°C (390°F).
Using a sharp knife, cut the tops off each bell pepper and carefully remove the seeds and membranes. Place them on a baking sheet lined with parchment paper.
Broil the peppers on the top rack for 5-7 minutes until the skins blister and blacken slightly, watching closely so they don't burn. This creates that smoky, charred flavor.
While the peppers char, cook the rice in boiling water according to package instructions until fluffy. Drain and set aside to cool slightly.
In a skillet, heat olive oil over medium heat until it shimmers. Add the ground meat or beans and cook until browned, about 8 minutes, breaking it apart with a spatula.
Add the diced onion and minced garlic to the skillet. Sauté until fragrant and translucent, about 2 minutes. Season with salt, pepper, and smoked paprika for depth.
Stir in the cooked rice and half of the shredded cheese, mixing until combined and heated through. Taste and adjust seasoning as needed.
Gently stuff each blistered pepper with the filling, pressing down softly to pack in the mixture. Arrange the stuffed peppers upright in a baking dish.
Top each stuffed pepper with a sprinkle of remaining cheese and a little Parmesan if using. Drizzle lightly with olive oil for a shiny finish.
Bake in the preheated oven for 20-25 minutes, until the cheese is bubbly and golden, and the peppers are tender when pierced with a fork.
Remove from the oven and let rest for 5 minutes. Squeeze a splash of lemon juice over the top for brightness, then serve warm, garnished with fresh herbs if desired.