Preheat your oven to 400°F. While it heats, bring a large pot of salted water to a boil. Prepare the bell peppers by cutting them in half lengthwise and carefully removing all seeds and membranes—this creates a clean vessel for the filling. Once the water is boiling, carefully add the pepper halves and blanch them for 6 minutes to slightly soften them and remove any raw bite. This par-cooking ensures they'll be tender throughout when baked. Drain the peppers well and set aside on paper towels to remove excess moisture, which prevents them from becoming watery during baking.

Heat 2 tablespoons of olive oil in a large skillet over medium heat. Add the finely diced yellow onion and sauté for 4 minutes until softened and translucent. Stir in the freshly minced garlic, rosemary, and aleppo pepper flakes and cook for 1 minute until fragrant—this blooming technique releases the essential oils and prevents the garlic from becoming bitter. Add the diced tomatoes and cook for 5 minutes, allowing them to release their juices and break down slightly. Stir in the tomato paste and cook for 1 additional minute to caramelize and concentrate its umami flavors. Remove from heat and let cool slightly.

In a large bowl, combine the ground pork, panko bread crumbs, the cooked tomato mixture from Step 2, salt, and black pepper. Mix gently with your hands or a wooden spoon until just combined—I find that overworking ground meat makes it dense and tough, so stop mixing as soon as everything is evenly distributed. The bread crumbs will absorb the moisture from the tomatoes and pork, creating a cohesive filling that holds together beautifully.

Arrange the blanched pepper halves in a baking dish (a 9x13 inch dish works well for 12 pepper halves) cut-side up. Lightly season the inside of each pepper with a pinch of salt and pepper. Divide the pork filling from Step 3 evenly among the peppers, mounding it gently in the center—don't pack it down, as this allows heat to penetrate and the filling to cook through. Drizzle the tops with the 3 tablespoons of extra virgin olive oil and sprinkle generously with the parmesan cheese. The oil helps the cheese brown and keeps the filling moist during baking.

Place the baking dish in the preheated 400°F oven and bake for 25 minutes until the pork is cooked through (internal temperature of 160°F if checking), the peppers are tender, and the cheese is golden brown on top. Remove from the oven and let rest for 2–3 minutes. Garnish with fresh chopped parsley to brighten the dish with a fresh herbal note just before serving. This simple finishing touch adds color and a burst of freshness that cuts through the richness of the pork and cheese.