Yup, I baked for a garage sale/fund raiser to help a family who had a family member with cancer. I packaged everything in small quantities thinking the buyers would part with $1-$3 for a few cookies, brownies, or rice crispie treats, when they wouldn't part with $5-$10 for something large. I know when I go to one of those sales, I don't have a lot of money so like to get several things with my pittance. I also made lots of dinner rolls out of frozen bread dough. I have made bread from scratch so didn't have a problem shaping them. You'll get on to it quickly if you try it. The rolls had a homemade look so sold quickly. You could make cinnamon rolls out of it too. I have a cookbook that has gobs of ways to use that frozen dough. Do a search online.
And on the label, I also included the ingredients so that the purchaser would know that there was wheat flour, eggs, chocolate, or whatever so if they have allergies, they will know up front.
What about doggie treats? Get a bone shaped cookie cutter or just cut them in squares or whatever. People are a soft touch for things for their pets. I even bought a bag of rawhide doggie chew bones at Costco and packaged them in sandwich bags individually, and sold them for a lot more than the cost of the package. SHHHH, don't tell anybody.
Oh yah, I made some bananna bread, blueberry muffins, (or simpler, make the blueberry muffin batter up in tins like the bananna bread and cut the loaf in sections to sell or use those tiny tins) and Bran muffins with raisins. I didn't put nuts in anything because they are expensive and there are so many people with allergies to them.
I didn't do cake or cupcakes because of the mess with frosting and trying to package them. If you did cupcakes, you could fill them and not bother with frosting.
You could go to a bulk food place and purchase candy/gummy worms (whatever is on sale) and bag it up in snack size bags. Most adults are suckers for candy, if not for themselves, then for their kids or grandkids, especially if it is a small amount.
The stuff I made sold out completely. This was maybe in June. Yesterday I received an email from the family with the cancer patient. The patient had just received word that the treatment which originally was not expected to work has, and the tumor has shrunk to the point now that the doctors feel they can do a successful surgery. They hadn't been given much hope in the beginning. RAHHHH!!