Preheat the oven to 350°F (175°C).
Cook the egg noodles according to package instructions until al dente. Drain and set aside.
In a large skillet, heat olive oil over medium heat.
Add the diced onion and cook for 3-4 minutes until softened.
Add the minced garlic and cook for 1 minute until fragrant.
Add the ground beef to the skillet and cook until browned, breaking it apart with a spoon, about 6-8 minutes. Drain excess fat.
Stir in the tomato sauce, diced tomatoes with their juice, Italian seasoning, salt, and black pepper. Simmer for 5 minutes.
In a large mixing bowl, combine the cooked noodles and the beef tomato sauce mixture. Mix well.
Transfer the mixture to a 9×13 inch baking dish.
Sprinkle the shredded cheddar and mozzarella cheeses evenly over the top.
Bake in the preheated oven for 20 minutes, or until the cheese is melted and bubbly.
Remove from the oven and let stand for 5 minutes before serving.