My kids have never been assigned "cooking projects", and I'm sure they never will. The schools in our county don't allow ANY homemade foods to be brought in to school due to the possibility of food-borne illnesses.
My DS (2nd grader) had to come up with his own original invention for a project last month. He did a really good job and did it on his own, I just helped him follow the order of directions. When we went to Academic Night at his school, the teacher had all the inventions displayed in the classroom. There were a few that looked like they were done by a child, many that were totally done by adults.
I know that some of these projects are not within the child's ability and the parents need to help, but the bulk of the work should be left to the child.
My DS (2nd grader) had to come up with his own original invention for a project last month. He did a really good job and did it on his own, I just helped him follow the order of directions. When we went to Academic Night at his school, the teacher had all the inventions displayed in the classroom. There were a few that looked like they were done by a child, many that were totally done by adults.

