Well, not really breakfast -- I guess you could call it "pre-breakfast." It has been a tradition since our daughters were babies that I make hot rolls on Christmas morning and serve them with hot chocolate, to be consumed while we are delving into our stockings.
For the first many years, I made cinnamon rolls. But at about the age of 15 our younger daughter developed a true allergy to cinnamon. She can't even smell the stuff or her breathing passages swell up in an anaphylactic reaction. It has the potential of being fatal. All cinnamon left the house at that time, and hasn't been back. So for the past twenty and more years it has been orange rolls. I use a recipe from the Better Homes and Gardens bread cookbook. If I ever fail to make the rolls, the reaction is swift and sure!
So we eat our fresh-from-the-oven orange rolls and drink our homemade hot chocolate (from Hershey's cocoa powder) while we see what silly things have been stuffed in our stockings. Then it's time for real breakfast, and then the opening of the main presents.