Preheat oven to 350 degrees F (175 degrees C).

Brown ground beef in a skillet over medium heat.

Add minced onion to the skillet and cook until softened.

Drain any excess grease from the skillet.

In a large bowl, combine the browned beef and onion mixture with cooked noodles, tomato sauce, salt, basil, and pepper.

Stir in 1 cup of shredded cheddar cheese.

Transfer the mixture to a 2-quart casserole dish.

Top with the remaining 1 cup of shredded cheddar cheese.

Bake in the preheated oven for 45 minutes, or until the cheese is melted and bubbly and the casserole is heated through.

Let cool slightly before serving. Garnish with sliced ripe olives before serving, if desired.