Well, you could start by making hard copies of some of your photographic work, like the breautiful photos of the macarons in this post, printed on a quality paper. Pick a bunch of your different food-themed works and make it into a nice little portfolio. Then start going around your local bakeries, cafés, sweet shops, cake shops, asking to see the owner or a manager, showing them your pictures and offering them to do similar photoshoots of their wares. You can emphasise how they will be able to use the pictures on their website, on their social media channels, and for advertisement both online and in print media. And, since you probably will be charging less than professional studios, they will be happy to collaborate with you and pay for your service.
How’s that for an idea of a hustle? ;)