There are two ways to adjust a convection oven for baking: 1. Reduce the temperature by 25 degrees. This is the most common way to adjust a convection oven for baking. If a recipe calls for baking at 350 degrees Fahrenheit, set the oven to 325 degrees Fahrenheit. 2. Cut the cooking time by 25 percent. This is another way to adjust a convection oven for baking. If a recipe calls for baking for 30 minutes, bake for 22 minutes. It is important to note that these are just general guidelines. The best way to adjust your convection oven for baking is to experiment and see what works best for you.