Make sure that the rubber of your oven's door seals well. Changes in temperature can cause a cake to flop. Also, make sure the temperature of the oven is correct. Remember that altitude has an influence on how cakes rise(see http://www.suite101.com/article.cfm/cake_decorating/31903)! Another thing - make sure not to bump the oven, or if you have wooden floors, do not walk on the planks on which your oven is. This disturbance can actually cause a cake to flop!
Source: Internet and my Mom.
69 mths ago