Techno: he was just minding his business, eating his potatoes. You were staying at his house for a bit as you had gotten seriously injured in the Nether. He left his plate next to him as he read and you walked up and stole a bite. He didn't really notice.
Dream: he had just made steak to take on his trip. You were supposed to be training, but you took a small break and came inside. You saw the food and took a piece, eating it and drinking some water before going back outside. He noticed but said nothing about it.
George: he had made mushroom stew for the next day. He was going to be traveling and he had made enough to last him a while. Until you took a bowl of it. He watched as you took it too. He told you to ask next time.
Sapnap: he was training outside, and you were watching him. He had packed food for himself the night before, not expecting you to join him. So when he looked over and saw you eating one of his apples he laughed. He told you to pack your own food next time.
Tommy: he brought food for both of you, cooked steak for him, and cooked mutton for you. He didn't notice at first, but then he saw you sneaking small bites. He told you to stop and cut off a small piece for you.
Tubbo: you had cooked breakfast for the house. Pancakes. He was half asleep and eating slowly when he noticed bits and pieces going missing every time he looked away. He realized his was you and shared the rest of his pancake.
Ranboo: he had quite a bit of chorus fruit left in a chest and every day he noticed one or two missing. Soon, he found you taking the chorus fruits. He chuckled and told you to just ask next time.
Bad: he made muffins the night before and left them in the table to cool. In the morning he noticed three of them missing. So, he went to ask you. When he entered your room, he saw you eating a muffin and working on your ripped jacket. He told you to ask next time if you wanted a muffin.
Wilbur: he had some golden apples in a jar in the kitchen. He was planning to use them for apple pie until he noticed them steadily decreasing. Soon, he caught you sneaking out of your room late at night to steal one. He caught you and said to wait until he at least made the apple pie.
Karl: he hadn't expected to see you at the masquerade that night. He tried to steer clear of you, he didn't want you to get hurt because of him. So when he was eating and he noticed his food was gone faster than he ate, he knew it was you. He told you to just get your own plate or ask next time.