Climate.gov. Making a solar oven (link opens a PDF) includes directions for building your solar oven and tips for cooking in it. You and your students can build a solar oven using materials that are commonly found in schools, homes, and grocery stores.
Applications for Education
Making a solar oven and baking some cookies in it could be a great way to get students excited to learn about solar energy. At the middle school and high school levels you could have students experiment with modifications of the original design to see if they can increase or decrease temperatures and cooking times in their solar ovens.