1. 1. Cook the elbow macaroni according to package instructions.

2. 2. In a skillet, cook the bacon until crispy. Remove and crumble into pieces.

3. 3. In the same skillet, sauté the zucchini until tender.

4. 4. Preheat the oven to 350°F (175°C).

5. 5. In a large bowl, mix together the cooked macaroni, crumbled bacon, sautéed zucchini, and shredded cheddar cheese.

6. 6. Pour in the milk and mix well to combine all ingredients.

7. 7. Transfer the mixture into a casserole dish and top with additional cheddar cheese.

8. 8. Bake in the preheated oven for 20-25 minutes or until the cheese is melted and bubbly.

9. 9. Serve hot and enjoy!