Thank You Brownies How Long Do I Bake Brownies In A 9x13 Glass Pan?

How long do I bake brownies in a 9x13 glass pan? - thank you brownies

The brownie mix, I have time to bake bread, the other sizes, but all I have is a 9x13 glass NAP does not appear in the box. How long should I bake the cake? Thank you!