1. 1. Preheat the oven to 350°F (180°C).

2. 2. In a large skillet, brown the diced onion and beef until the beef is cooked through.

3. 3. Add the corn, green beans, and canned tomatoes to the skillet and cook until heated through.

4. 4. In a separate bowl, mix the all-purpose flour and eggs to create a batter.

5. 5. Dip each piece of beef in the batter and place it in a baking dish.

6. 6. Pour the beef gravy over the beef and vegetable mixture in the baking dish.

7. 7. Bake in the preheated oven for 30 minutes or until the casserole is bubbling and heated through.

8. 8. Serve the casserole over a bed of white rice and noodles.

9. 9. Enjoy your delicious Beef and Vegetable Casserole!