Wisconsin

Yes you would need a license from the ag department, and you would need to produce the food in a commercial kitchen. https://forrager.com/faq/#commercial

Dina, Wisconsin still doesn’t allow homemade baked goods to be sold. Aside from finding and going to a commercial kitchen, I think your options are a) building a commercial kitchen in your home, or b) donating your baked goods.

If you are taking a commercially-produced food item and altering it in any way, you are then processing it, which must be done in a commercial kitchen. You can resell some types of commercially-prepackaged items without needing a commercial kitchen, but that doesn’t sound like it would apply in this case. http://forrager.com/faq/#commercial