In a large skillet, heat the olive oil over medium heat.
Add the chopped onion and minced garlic, and sauté until they become translucent.
Add the ground beef and cook until it's browned and crumbled.
Stir in the crushed tomatoes, tomato sauce, dried oregano, dried basil, salt, and pepper.
Simmer the sauce for about 20 minutes, stirring occasionally, until it thickens.