Yes, you can use any size baking pan that you prefer, but you may have to adjust the cooking times according to what size baking pan you use. Thicker brownies will take longer to cook than thin brownies. You can see my u003ca href=u0022https://www.ditchthecarbs.com/baking-pan-conversion-charts/u0022u003ebaking size conversion chartsu003c/au003e here.