Poor Tony. I'm sure the think-y part of his brain knows Bucky had just about as much control as Bucky's gun, but the part of his brain that had to lose his parents and deal with that bit of grief wants to hit someone, and Hydra isn't available. Then add in that no one trusted Tony with the 'Hydra used the Winter Soldier to kill your folks'. (I can imagine he wants to have Words with Steve and Natasha on that.)
Other than Steve complimenting Natasha's cooking, the three were mostly focused on their food and not on conversation, so without having to use words between bites, breakfast went quickly.
Well, you have two soldiers, and I expect Natasha knows how to fit in with soldiers. ON a mission, eat quickly, in case you don't get to finish (or eat hot food again anytime soon).