Preheat the oven to 375°F (190°C) and lightly grease a 9x13 inch ceramic baking dish.
Heat olive oil in a large skillet over medium-high heat. Add the red onion and bell pepper, sautéing for 5 minutes until softened.
Stir in the minced garlic, chili powder, cumin, and smoked paprika. Cook for 60 seconds until fragrant.
In a large mixing bowl, combine the spiralized sweet potato noodles, shredded chicken, black beans, salsa, chicken broth, and the sautéed vegetable mixture.
Toss the mixture thoroughly using tongs to ensure the spices and liquid are evenly distributed across the sweet potato spirals.
Transfer the mixture into the prepared baking dish, pressing down slightly to level the surface.
Cover the dish tightly with aluminum foil and bake for 30 minutes, or until the sweet potato noodles reach a tender al dente texture.
Remove the foil, sprinkle the shredded cheese evenly over the top, and return to the oven for 10 minutes or until the cheese is melted and lightly golden.
Allow the casserole to rest for 5 minutes. Garnish with fresh cilantro and jalapeño before slicing into portions.