**If you decide to use a glass pan it will take longer to bake than a metal pan. Just bake until toothpick inserted in the center comes out clean. I used a glass pan and cooked mine almost 90 minutes. I'm investing in a good metal square pan. Glass pans are a poor conductor of heat and usually take much longer to bake things. I would either bake this in a metal pan or instead of using a 9" square use a rectangle pan for quicker baking.