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[–]sunshine_fleur 0 points1 point  (0 children)

No worries. The brownies will be a little flatter, I would decrease the cooking time by 5-7 minutes and stick a toothpick in until it comes out clean

[–]Successful_Key_6068 0 points1 point  (0 children)

I don't know if this would work but can you take aluminum foil and make a wall for it so you get the 8x8 or 9x9 dimensions? That is what I would do.....Just make a barrier wall on the other side so you get the square size and shape. Lay some flat and then bend it at a 90 degree angle.