Sidecar Doughnuts and Coffee 270 E. 17th St., #18, Costa Mesa, CA 92627 949.873.5424 Website Back Sidecar Doughnuts serves specialty handmade doughnuts and coffee out of a small storefront on 17th Street. All of the doughnuts are made daily from scratch. With incredible flavors like birthday cake and lemon poppy seed, these delights move fast.