Preheat the oven. Set to 375°F (190°C). Lightly grease a 9x13-inch baking dish.
Sauté the aromatics. Warm 1 tbsp oil in a large skillet over medium heat.
Add onion and bell pepper with a pinch of salt. Cook 5–7 minutes until softened and lightly golden.
Brown the meat. Add ground turkey to the skillet. Break it up with a spatula and cook until no longer pink, about 6–8 minutes.
Season with taco seasoning, smoked paprika, and coriander. Stir to coat.
Add the veggies and beans. Stir in black beans, corn, and drained fire-roasted tomatoes. Cook 2–3 minutes to warm through.
Taste and adjust salt and pepper.
Add salsa and yogurt. Reduce heat to low. Stir in salsa and Greek yogurt until creamy and well combined. Fold in half the cilantro and half the green onions.
Assemble the casserole. Transfer the mixture to the prepared baking dish.
Spread evenly and top with shredded cheese.
Bake. Place in the oven for 15–18 minutes, until the cheese is melted and bubbly around the edges.
Rest and garnish. Let it rest 5 minutes. Top with remaining cilantro and green onions. Serve with lime wedges.
Optional toppings. Add pickled jalapeños for heat, a spoon of Greek yogurt instead of sour cream, or avocado for richness.