Bake one stromboli on a sheet pan at 375°F for 25-30 minutes. If baking two at a time, rotate the pans halfway through baking. Note: the cook time may be longer when baking two at a time. Remove from the oven when golden brown on top. Let stand for 10 minutes. (Note: Some of the cheese and grease may spill out. Just wipe up with a paper towel.)