Preheat your oven to 350°F (175°C) and prepare your baking dish by greasing it lightly.

In a large pot, bring salted water to a boil and cook the pasta until al dente, about 7-8 minutes. Drain and set aside.

In a large skillet over medium heat, brown the ground beef for 5-7 minutes. Add the chopped onion and sauté until translucent.

Pour in the sloppy joe sauce and mix well, then fold in the cooked pasta until combined.

Transfer the mixture to your greased baking dish, spreading evenly and patting it down.

Sprinkle shredded cheddar cheese over the top to cover completely.

Bake in the preheated oven for 20-25 minutes until cheese is melted and bubbly.

Remove from the oven and allow to cool for 5-10 minutes before serving.