Preheat the oven to 350°F (175°C).
Cook the egg noodles according to package instructions until al dente. Drain and set aside.
Heat olive oil in a large skillet over medium heat. Add diced onion and cook until softened, about 3-4 minutes.
Add minced garlic and cook for 30 seconds until fragrant.
Add ground beef to the skillet and cook, breaking it apart with a spoon, until browned and cooked through, about 6-8 minutes. Drain excess fat.
Stir in diced tomatoes with their juice, tomato sauce, dried Italian seasoning, salt, and black pepper. Simmer for 5 minutes to combine flavors.
In a large mixing bowl, combine the cooked egg noodles and the ground beef tomato mixture. Stir until evenly mixed.
Transfer the mixture to a 9×13 inch baking dish and spread evenly.
Sprinkle shredded cheddar cheese and mozzarella cheese evenly over the top.
Bake in the preheated oven for 20 minutes, or until the cheese is melted and bubbly.
Remove from oven and let cool for 5 minutes before serving.