Baking these big loaves always seems to be a problem. It seems the middle of the loaf is always gooey or the outside is too crusty.
It takes a long time to drive the heat through a dense quick bread. The outside starts to get dark, yet when you stick a toothpick in the center, it comes out wet. It’s not baked all the way through.
So, you cover the top with aluminum foil to keep it from getting darker and you’re tempted to turn the temperature up.