I’m looking for a children’s book that I read in the early 2000’s. The plot is that there’s a baking competition at this boy’s elementary school. All of his friend’s moms sign up to bake, but when he goes to ask his mom she can’t for whatever reason (I think she may have had work? I vaguely remember him lying in bed trying to fall asleep and hearing her type, but that might be wrong). His dad volunteers, and the kid is kind of embarrassed but he agrees. He wakes up the next morning and his dad has the cake under a cake server lid so he can’t see it. At some point he shows him the cake, and it basically looks like a large black tire. The kid is stressed that it’s not as pretty as the other cakes. The parents (all moms except the one dad) line up in a row and the teacher goes around tasting the cakes. When the teacher gets to the dad, he asks her for the knife to cut it. The kid becomes even more embarrassed because he thinks the dad is trying to be chivalrous. The dad takes the knife and instead of cutting the cake, he starts carving it. All of these beautiful rainbow flowers and designs start to appear and everyone is stunned and suitably impressed. I think they end up winning first place and there’s a happy ending.