Why is the 8x8 inch glass pan not recommended when using brownie mix?

The box says you can use a metal or a glass pan, but if using an 8x8 inch pan, glass is not recommended. It doesn't say WHY it is not recommended, and that's a pet peeve of mine. What am I, a robot who will mindlessly follow instructions without knowing the reason behind them?

I love to bake brownies with my 8x8 glass pan in my toaster oven, and they seem to come out fine.

6 Answers

  • kksay
    Lv 5
    1 decade ago
    Favorite Answer

    Glass cooks things hotter and it is recommended to set your oven 25 degrees cooler than if you were using a metal pan so you will have the same outcome. I always use glass pans to bake in and have never had a problem. I actually like the product better in glass. Good for you to not just mindlessly following instructions without knowing the reason behind them. Send and e-mail to the company with this question. You'd be surprised at the response you'll get. Yay brownies!

  • Anonymous
    1 decade ago

    i don't think that its about the glass but rather about heat distribution:

    A 9x13 has 117 square inches of surface area .If you poured your brownie mixture to a depth of 1" you would of course have 117 cubic inches

    . An 8x8 pan has a surface area of 64 square inches, if you poured the same quantity of mixture into the 8x8 pan it would have a depth of almost 2 inches. The significant difference in the surface area to volume relationship between a 9x13 pan and an 8x8 pan will significantly alter the cooking times and temperatures. I'm pretty sure the glass has something to do with it also - insofar as thermal mass and other things go.

    Source(s): a pro w/ teaching experience
  • 1 decade ago

    I think it is because they hold the heat longer and technically could still be cooking the brownies for a couple minutes when you take it out.

    Brownies are supposed to come out of the oven when the center is still a little jiggley, it sets as it cools. If you don't watch it they will be over cooked.

    I cook all my cakes etc in a 9x13 glass "pyrex" brand pan. It comes out great every time.

  • Anonymous
    1 decade ago

    It is because they assume most bakers do not have common sense to cool them longer since they are in a smaller pan and glass cooks hotter. I have used my 8x8 glass pan for years and also have had no problems...

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  • 1 decade ago

    Because the glass dish gets hotter, and with the smaller size may cause brownies to burn or cook more on the outside. However if you set it at a lower temp as someone else already suggested you should be fine as long as you monitor it closely toward the end of the cooking time.

  • ?
    Lv 4
    5 years ago

    Yes you can definitely use regular pan .

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