We've done it for years, Scuba, and no one has ever even asked us about what we had in the cooler upon reentering the US. We have been questioned/cautioned about plants, root crops, fruit or if we've been on a farm but no one has ever said a word about the croissants and pastries. I did briefly get into trouble one time due to a half eaten roast beef grinder that a drug dog sniffed out at JFK. The handler apologized and explained the pup was young and still in training and got confused every now and then.
"Always keep your words soft and sweet, just in case you have to eat