No, plastic containers designed for microwave ovens should not be used in regular ovens to bake cakes or cookies. Microwave-safe plastic containers are typically not suitable for use in conventional ovens because they have lower melting points and may warp, melt, or release harmful chemicals when exposed to higher temperatures.
Plastic containers that are labeled as microwave-safe are intended for use in the microwave, where the heating process is different from that of a regular oven. Microwave ovens heat food primarily through the excitation of water molecules, while conventional ovens use hot air to cook food evenly. The higher temperatures reached in a regular oven can exceed the limits of microwave-safe plastic, causing it to melt, deform, and potentially release toxic substances.
For baking cakes or cookies in a regular oven, it is advisable to use oven-safe glass, ceramic, or metal baking pans or sheets specifically designed for oven use. These materials can withstand the high temperatures required for baking and are less likely to pose any health or safety risks. Always refer to the manufacturer's instructions for your specific bakeware to ensure it is safe for oven use.