01 - Preheat oven to 375°F. Stand bell peppers upright in a baking dish, drizzle lightly with olive oil, and roast for 10 minutes until slightly softened. Remove from oven and set aside.
02 - Place diced potatoes in a large pot, cover with salted water, and bring to a boil over high heat. Cook for 10-12 minutes until fork-tender. Drain thoroughly and set aside.
03 - Heat 2 tablespoons olive oil in a large skillet over medium heat. Add chopped onion and garlic; sauté for 2-3 minutes until fragrant and translucent.
04 - Stir in diced zucchini and corn kernels. Continue cooking for 3 minutes until zucchini begins to soften but still holds its shape.
05 - Add cooked potatoes, black beans, Cajun seasoning, smoked paprika, dried thyme, salt, and pepper to the skillet. Stir well and cook for 2 minutes to blend flavors. Remove from heat.
06 - Lightly mash the potato mixture, leaving some chunks for texture. Mix in milk, half the cheese, and half the parsley until well combined.
07 - Spoon the filling mixture evenly into each roasted bell pepper, packing gently. Sprinkle tops with remaining cheese and breadcrumbs.
08 - Return stuffed peppers to the oven and bake for 25-30 minutes until tops are golden brown and peppers are completely tender when pierced with a fork.
09 - Remove from oven and sprinkle with remaining fresh parsley. Serve hot while cheese is still melted and bubbly.