Wash the bell pepper and cut it in half lengthwise. Remove the stem completely. Scrape out the seeds as well. Make sure there is nothing left inside so that you can fill it easily.
Lightly oil the bottom of an oven-safe dish. Place the halved peppers in it, sprinkle with a bit of salt, and let them sit while you prepare the rest.
Cook the brown rice according to the package instructions, then set it aside.
Preheat the oven to 200°C or 392°F (bottom and top heating with air circulation).
Prepare the bean-corn ragout:Peel and chop the onions; set aside.In a deep pan, heat the olive oil and sauté half of the chopped onions until softened.Add the ground meat, season with salt and pepper, and cook while stirring.Grate in the garlic cloves and sauté briefly with the meat.Add the tomato purée, drained beans, and sweet corn (including their juices), along with the remaining onions. Season with basil and oregano and briefly cook together. Scoop out one ladle of the ragout and set it aside. Mix the pre-cooked brown rice into the remaining ragout in the pan, then spoon the mixture into the pepper halves.
Bake in the preheated oven for approximately 20 minutes, until the tops turn nicely crispy. Remove from the oven and while still hot, grate Parmesan cheese over the stuffed peppers. When serving, drizzle with zucchini cream (if using), garnish with fresh basil leaves, and serve the reserved bean-corn ragout either underneath or alongside the peppers.