If you don’t want to offer a full line of meals, why not focus on one thing? For instance, there are plenty of shops on Etsy that sell homemade gourmet cookies (e.g. Earl Gray Sandwich cookies, Cupcakes in a Jar, or gourmet caramels). I’ve been thinking about selling homemade gourmet jam (i.e. home canning recipes) during the summer months. I’ve read of other people who have started a gourmet cocktail catering business, where they come to parties and make gourmet cocktails. Fun!
I surprisingly get a lot of people asking to detail their car. I never intend to make a business of it, but I love doing it to my cars and people ask me to do it to theirs. All it takes is a cheap orbital buffer (mines a used craftsman) and a shop vac. I normally get easily $100 for a basic wash/wax/vac, or $200 to remove scratches and polish then wax the car.