Bring a large pot of salted water to a rolling boil. Add rotini pasta and cook for 7-9 minutes until al dente, then drain.

Heat olive oil in a large skillet over medium heat. Sauté onion until soft, then add garlic and cook until fragrant.

Add ground beef to the skillet, stirring until fully cooked, about 5-7 minutes. Drain excess grease.

Stir in sweet corn, marinara sauce, and optional spices. Simmer for 5 minutes.

In a mixing bowl, combine the pasta with the beef mixture. Fold in sour cream if using.

Preheat oven to 375°F (190°C). Grease a baking dish, spread the pasta mixture evenly.

Sprinkle shredded cheddar cheese over the top.

Bake uncovered for 15-20 minutes until the cheese is melted and bubbly.

Let rest for 5 minutes before garnishing and serving.