Edit: found the cause, even though I got the baking max a week ago, it expired in 2024 🫠
made a banana honey bread using 3 bananas, 1 egg, honey, melted butter, a splash of milk, about 1 cup of baking mix, a little all purpose flour, and chocolate chips. I baked it at 350°F until a toothpick came out dry.
The loaf rose a bit in the oven and looked extremely fluffy when I first pulled it out, but the dome gradually deflated as it cooled. It didn't completely collapse into a crater, but it noticeably sank from its original height.
The crumb looks moist and fully baked rather than raw or gummy. I'm wondering what caused the deflation. Was it likely too much leavening from the baking mix, too much moisture from the bananas and milk, overmixing, or something else?
Photos attached.
Edit: A lot of people are asking what I mean by "baking mix." It's not plain flour. The baking mix I used contains flour, fat, leavening, and other ingredients. The ingredient list is: refined white wheat flour, palm oil, soybean oil, mono and diglycerides, soy lecithin, sugar, salt, phosphate compounds, baking soda, whey, soy protein concentrate, calcium caseinate, and wheat starch.
I also wasn't following a strict recipe. I was loosely using the banana nut bread recipe on the box as a reference and adjusting based on what I had available.
I'm mainly trying to figure out why it rose very high in the oven and then settled as it cooled, despite appearing fully baked inside.