Jason didn't have down time often. Between patrol, the Outlaws, trying to have any semblance of a social life, spending time with you and sleeping, he was stretched pretty thin. But around the end of summer, for some reason crime dropped off. Maybe it was the fact you could fry an egg on the sidewalk, but neither criminals nor villains want to boil while doing crime.
So Jason had free time. And since he doesn't get that often, he has no idea what to do with himself. For the first two days, he cleaned the apartment so his partner wouldn't have to. Then, he went grocery shopping, where he nearly had a heart attack from the amount of people and noise. He promptly went home with nothing and decided all of his free time was better spent at home.
He'd always liked baking with Alfred, so on his partner's next trip to the grocery store, he asked for the supplies he needed to make cookies. And that was how his evening was spent.
He put on an apron, one that his partner had from previous rounds of hyper-fixations and stress baking, that said "Kiss the Cook" and began.
By the time his partner arrived home, he had made four batches of cookies. The sugar cookies were laid out first on the kitchen island, next the two chocolate chip batches, and finally the snicker-doodle batch he'd just pulled from the oven. He gave his partner a bright grin. "Hello, my love. I made cookies."