Why did my zucchini bread fall in the middle?

Chef's answer
The editors said one of the most common reasons layer cakes and quick breads fall is that the pan is overfilled. "If the batter reaches the top of the pan and still needs to rise, it will collapse," they wrote. They also recommended checking to make sure the leavening (baking soda or baking powder) was not stale.
Frequently asked Questions 🎓
However, regular bread is not that much healthier than pita bread because while it beats pita bread in some areas of nutritional value, it is nearly equal to it in others. ... Whole wheat bread has fewer carbs, too, with a 60 gram slice only adding nearly 28 grams of carbs.
(The regular size pita has 9 carbs, but 2 grams of fiber and 0 sugars for 7 net carbs. Of course this pita bread isn't Keto or gluten-free, but for anyone who's following a carb-conscious or low-glycemic eating plan, they're perfect to stuff with something healthy and eat occasionally for a quick meal.
The reasoning is pretty simple- it's in the science of the puff. When the pita is placed in a very hot oven, the heat coming at it from every angle begins to cook the outside of the dough. At the same time, moisture builds up in the middle of the dough, eventually causing a big puff of steam.
Both naan and pita are what are considered flatbreads, but they are very different. The ingredients used to make each of them are unique. Pita bread usually has yeast, sugar, flour, salt, and olive oil, while Naan bread has many of those ingredients plus eggs, butter, and yogurt..
A few more cooking questions 📍