The key to sheet pan dinners is pairing ingredients that bake at the same rate, or staging them appropriately so that they don't overcook or undercook based on their individual cooking times. In this case, I had to give the broccoli and carrots a head start for 12 minutes, then once the salmon is added in they cook for 14 more minutes. The salmon is medium-well after 14 minutes at 425 degrees F.