Throw a bake sale if you like to cook. Choose classic recipes that are easy to make in big batches like chewy chocolate chip cookies, fudgy brownies, or vanilla cupcakes. Once you bake everything, separate your goodies into individual servings and place them in pretty packages like treat bags tied with ribbons. Set up a stand in your front yard or out on the street corner to get more traffic.
These ways of making extra money cover a wide range in terms of compensation and prestige. Check out the options to see what could work for you, keeping tabs on a projected per-hour rate so you can see what would be worth your time. The list is loosely arranged by 1. jobs requiring more skill or expertise, 2. gigs needing less and 3. things you can sell. And if you think of any good options I missed, please let me know in the comments.