1. 1. Preheat the oven to 375°F (190°C).

2. 2. Cook the noodles according to package instructions, then drain and set aside.

3. 3. In a large skillet, heat olive oil over medium heat. Add chopped onion and sauté until translucent.

4. 4. Add diced tomatoes and broccoli florets to the skillet. Cook until the broccoli is tender-crisp.

5. 5. In a separate saucepan, melt butter over medium heat. Stir in cheddar cheese soup, cream cheese, and milk until smooth and creamy.

6. 6. Combine the cooked noodles, broccoli mixture, and cheese sauce in a large mixing bowl. Mix well to coat everything evenly.

7. 7. Transfer the mixture to a greased baking dish.

8. 8. Sprinkle shredded cheddar cheese on top of the casserole.

9. 9. Bake in the preheated oven for 25-30 minutes, or until the cheese is melted and bubbly.

10. 10. Serve hot and enjoy!