Why does my zucchini bread sink in the middle?

Related questions

1. Why are my zucchini turning yellow?
2. Can I leave zucchini out?
3. Should Kiwi be refrigerated?
4. Should I Salt zucchini before cooking?
5. Should I cut the dead leaves off my zucchini plant?
6. Can I freeze zucchini?
7. Why does my zucchini bread stick to the pan?
8. What does zucchini bread taste like?
9. Can you buy grated zucchini?
10. How many zucchini do you get from one plant?

Tags

1. #cakes
2. #breadand
3. #mixed
4. #quickly
5. #reason
6. #incorporates
7. #zucchini
8. #breads
9. #stable
10. #vigorously
11. #ingredients
12. #collapse
13. #bubbles
14. #quick
15. #batter
16. #which
17. #common
18. #other