Cover your sheet pain in full foil and spray down with cooking spray to prevent sticking.
Crack your 12 eggs carefully, making sure not to get any shells in the sheet pan. Try to crack your yolks in ways that keep your eggs in their own section to make for an easy spatula cut.
Season top of eggs with salt and pepper to taste
Once oven has reached 425, put the sheet pan in the oven until desired yolk center.
The oven I work with often runs hot and not all ovens are predicable to what temperature they say. The first time you make eggs on a sheet pan, you will want to monitor them closely until you know the timing. Here is how my oven worked out
8 minutes for a runny yolk
10 minutes for a soft boil (as shown)
12 minutes for a hard boil
SEE ARTICLE FOR NOTES ABOUT COOKING TIMES IN YOUR OVEN