I am not sure what you mean by switching bottom to top.
Do you have a commercial or consumer convection oven. Does the fan turn on and off.
Seems to me, I recall a thread that said to reduce the heat by 25 degrees.... and for cakes, they recommended turning off the fan so the tops would bake evenly. (Guess the blowing makes them lop-sided.)
Don't think you have to rotate the cookie sheets.
HTH
P.S. If you were asking for help with a conventional oven - yes, you do have to rotate the cookie sheets, just like you would cake pans!
All I use is a convection oven and I don't have problems with lopsided cakes at all. Now cupcakes are a different story. I have to use my regular oven for them. Also, I never interchange or turn my cookie sheets either.
Good Morning, Zmama,
A convection oven has a fan that circulates the air, causing a breeze in the oven. The fan comes on automatically when the oven reaches temp. A regular oven doesn't have a fan.
A lower temp. is frequently used in a convection oven because of the "better" circulation of the heat. And, it's suppose to cut cooking time. I don't know how this affects cakes and cookies, but it is valid for a roast or turkey.
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