One evening after dinner Ryan and I ran to a friend's nearby farm. We were in search of a couple scrap pieces of weathered wood and found exactly what we needed after a few minutes. We then measured the wall where we wanted the chalkboard to hang, cut the wood to size creating the frame and inserted a cut piece of thin masonite board. From there Ryan painted the masonite with black chalkboard paint and after letting it dry for 24 hours, secured it to the wall.
We can now add "Audrey is the teacher and Ollie is the student" to their list of favorite pretend play scenarios. They're both thrilled.