There are so many recipes using cake mixes that are great for working with kids. They make the whole process so much easier and they can actually taste good. Here’s one. It uses Snickers bars so it’s dairy although I suppose you could try to find a pareve substitute.
1 package yellow cake mix
½ cup brown sugar
½ cup butter or margarine, melted
2 King-size (3.29 ounces) Snickers bars, chopped
Preheat oven to 350 degrees. Beat together the cake mix, brown sugar and eggs until well-blended. Stir in the chopped chocolate bars. Pour into an ungreased 9 x 13-inch pan. Bake for 25 to 30 minutes. Cool on a wire rack and cut into squares. All ages like this!