Why your butter cake sinks (and how to fix it)

A sunken middle is the most common butter cake problem, and it is almost always fixable.

Check your oven temperature with a thermometer: many ovens run cooler than the dial says.

Measure flour by weight and don't over-beat once the flour is in. Too much air makes the cake rise fast and fall back.

Resist opening the oven door during the first two-thirds of the baking time.