Preheat the oven to 350°F (175°C).
In a large skillet, brown the ground beef over medium heat.
Add chopped onions and bell peppers; cook until softened.
Stir in diced tomatoes and seasonings, simmer for 5 minutes.
Mix in the cooked pasta until well combined.
Transfer the mixture to a greased 9x13-inch baking dish.
Sprinkle shredded cheddar cheese evenly on top.
Bake in the preheated oven for 20 minutes, until cheese is melted.
Remove from oven and let cool for 5 minutes.
Garnish with fresh parsley before serving.