Yelena, Ava and Bob can't cook or bake worth shit, none of them have any idea how to. John on the other hand is an amazing cook and baker, he was always good at it but got really good at it when Olivia was pregnant and postpartum, as he always made her whatever she was craving and was responsible for supper most nights as she didn't have the energy, plus cooking and baking worked as a good distraction from everything.
One day after Bob almost burnt down the kitchen, John decides to teach him to cook. Ava ends up joining in on the lesson, while Yelena sits at the kitchen island watching, eventually John ends up forcing her to join in, knowing she needs the lesson just as much as the other two.
Now once a week they all cook/bake something together.
Thankfully the main kitchen in the tower is pretty big, but without fail every time playfully bickering breaks out between them about them being in each other's way. It also isn't uncommon that when their baking a flower fight breaks out.
Occasionally one (or all of them) of them get way too handsy in the kitchen, resulting in make out sessions while things are in the oven.