Can Wax Paper Go in the Oven: Use Parchment
No—wax paper should not be exposed directly to oven heat. Its wax coating can soften, smoke, transfer to food, or potentially ignite if it touches a hot oven surface or heating element. Some manufacturers allow wax paper as a fully covered pan liner for certain baked goods, but parchment paper, a greased pan, or a silicone mat is the safer general choice.