How do I make my cake light and fluffy?

How do I make my cake light and fluffy?

Egg whites are drying agents and too many will reduce the moisture content of the batter. To achieve extra fluffy cakes, especially when making vanilla cakes, separate the egg whites from the egg yolk, make the batter with the egg yolks, beat the egg whites separately and fold it into the batter in the end.

Does baking time change with pan size?

Just increase the oven temp by 25 degrees F and decrease the bake time by a quarter. In this particular example, since your pan is 1 inch larger, more surface area will be exposed. The liquid in the cake batter will evaporate quicker, which means it will bake faster.