Sheila - from Baton Rouge, LA
If you are using a cake mix, you’ll have greater success holding the 3rd pan of batter and baking it a bit later than the other two. If you are making a cake from scratch, it might be a problem. If you can fit all 3 pans into the oven in any way, it’s always best to bake all the batter at once. One-half to two-thirds through the baking time listed in your recipe (or on the mix), rearrange the pans – top to bottom, back of the oven to front. That should help the layers bake more consistently and evenly.