Is It Kosher? Pop-Tarts are kosher when the carton carries a reliable hechsher, and most boxes sold in the United States do carry one. The complication is not whether a symbol exists. It is the small letter printed next to it, because a dairy designation changes when and with what you can eat the pastry.
Is It Kosher? Yes, Oreos sold in the United States are kosher. Every standard variety carries OU-D certification from the Orthodox Union, meaning they are certified kosher dairy. Outside the US the answer gets more complicated, and this guide walks through exactly what to check on the package.