Read this in January 1995. It is a Judy Blume or Louis Sachar-esque children’s chapter book. Some kids are doing some kind of report and/or competition to create outlandish dishes by new and inventive means.
The protagonist, a boy, decides to experiment by putting insects in the food. In one scene, he brings brownies to school that he’s put roaches in. (Particularly memorable because it just so happened I brought brownies to class for my birthday that day when we got to that chapter and everyone got a big laugh about the coincidence). He finds out that his chief rival is using the car to cook food; they come out of church or a PTA meeting to the smell of hamburgers because he put the patties on the hot engine. Thanks!