Preheat your oven to 180°C (350°F) and lightly grease your baking dish to keep the peppers from sticking.
Cut the tops off each bell pepper and carefully scoop out the seeds and membranes, creating a hollow cavity. Rinse the peppers gently and place them upright in the baking dish.
Heat olive oil in a sauté pan over medium heat. Add diced onion and minced garlic, cooking until fragrant and translucent, about 3 minutes. You’ll notice the onions turn glossy and start to soften.
Add the cooked grains, chopped tomatoes, smoked paprika, and a pinch of salt and pepper to the pan. Stir everything together and cook for another 5 minutes, allowing the flavors to meld and the mixture to heat through. It should smell warm and savory with a hint of spice.
Spoon the filling mixture into each prepared pepper, packing it in gently but firmly. Fill them until they are overflowing slightly, creating a vibrant, colorful mound of stuffing.
Place the stuffed peppers upright in the baking dish. Cover loosely with foil if you like, to keep the peppers moist during baking.
Bake in the preheated oven for 25-30 minutes, until the peppers are tender and slightly blistered, with some charred spots on the skin for extra flavor. The filling should be hot and bubbling.
Remove the peppers from the oven and let them rest for about 5 minutes. This helps the filling settle and makes handling easier.
Finish by sprinkling chopped fresh parsley over the top of each pepper for a burst of herbal brightness. Squeeze a little lemon juice if desired for added freshness.
Serve the vibrant stuffed peppers warm, enjoying the colorful presentation and hearty, flavorful filling. They make a satisfying main or side dish that celebrates seasonal produce.