What makes a pound cake sink in the middle?

1. Incorrect Oven Temperature: If the oven temperature is too low, the cake may not bake evenly and can sink in the middle. Make sure to preheat your oven to the correct temperature before baking.

2. Overmixing the Batter: Overmixing the batter can cause too much air to be incorporated into the cake, leading to a sunken center. Mix the ingredients until just combined and avoid over-beating.

3. Insufficient Flour: Not using enough flour can cause the cake to lack the necessary structure to hold its shape. Make sure to measure the flour accurately according to the recipe.

4. Opening the Oven Door: Opening the oven door during baking can cause the cake to lose heat and collapse. Avoid opening the oven door until the cake is almost done.

5. Uneven Baking: If the oven temperature is uneven or if the cake is placed too close to the heating element, it can cause the cake to bake unevenly and sink in the middle. Make sure to place the cake in the center of the oven for even baking.

6. Glass Baking Pan: Using a glass baking pan can cause the cake to sink in the middle due to uneven heat distribution. If possible, use a metal baking pan for a more consistent bake.

7. Incorrect Rising Agent: If you accidentally use baking soda instead of baking powder, the cake will not rise properly and may sink. Make sure you are using the correct rising agent as specified in the recipe.