This is completely original to me, and nowhere in the book.
Aunt Polly decided to make some cookies. She felt that things had become strained between Tom and her, what with his constant pranks and shenanigans. She did feel that she had been harsh earlier in the week, but really, what did he expect would happen when he put mud in her washing basin when she wasn’t looking? Anyway, some cookies would make it better. She started the cookies (switching the salt and sugar back to the way they had been before Tom had switched them) and put them in the oven. After a couple of chapters in her book she took them out of the oven and set them on the window sill to cool down. As if her years had taught her nothing, she left them unguarded.
Muff Potter, the town drunk, was just waking up to a hangover. He was groggy, but something strong still caught his nose. As he sniffed around he realized what he was smelling. His eyes widened when he got to the window.
Huckleberry Finn was, by contrast, fully awake, and had been for a while. He had smelled the cookies as well, but had backed off when he saw Muff. Soon as he had gone though, (with four cookies! Greedy old thing) Huck went in towards the window. He was just glad he’d gotten there before Tom had woken up, otherwise he might not have gotten a cookie, and Potter certainly wouldn’t have!
Potter couldn’t believe his luck! He just got away with four whole cookies! His excitement, however, abated as soon as he saw Injun Joe walking towards the same tavern he was going to. He considered turning around, but decided Joe would see him do it.
“Hey, Muff!” that was Joe. “What’s that you you got there?” This was good. He seemed to be happy. Potter decided to risk it
“What der you mean?” it occurred to Potter he might still be a little hungover. Joe immediately lost his good humor.
“The thing behind your back. Give it here.”
“C’mon now, Joe-”
“Now.”
Muff sighed and handed over the cookies. Joe took them and studied them, then ate one.
“That’s a good cookie.” he eventually said, then ate another one. He made no sign of giving them back to Muff. This made Muff sad.
“Well, welcome, I guess.”
Later, Joey Harper went over to see Tom, to make sure they were still on for a play war later in the day, but found the Tom wasn’t awake yet. He also found the cookies. He took a couple, then decided to take a couple more to Amy Lawrence, trying to impress her.
Both Mary and Sid woke up before Tom, and decided to help themselves to a cookie. By the time Tom did wake up he went to the kitchen and ate the second-to-last cookie right there in the kitchen. Unfortunately, Aunt Polly had decided that the cookies were probably cool enough now.
Tom did not know what had gotten into his aunt! That was one of the worst beatings he’d gotten! Somethin’ bout breaking her trust- He didn’t know what she was talking about! It was only one cookie! But still, he had a play war to get to with Joey Harper, so he decided to just get on with his day, but still, Joey and Huck were actin’ real weird when he showed up that afternoon.