Food fright and Par for the course

In this collection of two novels, somebody has been eating Cyborg's sandwiches, but all the other Teen Titans protest their innocence, so Cyborg employs a high-tech security system to catch the culprit; in the second story Beast Boy, Robin, and Cyborg are playing mini-golf, but their competitive instincts get in the way of the game. Written in graphic-novel format.