S.W.
This isn't about food, but I thought I'd mention it since you said you've got a little car fanatic. . . . Ramps and cars are so much fun for everyone! You can get cheap toy cars at the dollar store or Target and have them be party favors, and then make games with ramps made from various materials--cardboard, rain gutters, vinyl strips from Home Depot, etc. The kids can have races and experiment with leaning the ramps off playground equipment and benches. My kids love ramps and like seeing what will roll and what will crash and what's faster and on and on. It's cheap and endlessly appealing for a wide age range (including parents! ;)
Have fun!