Tillie Doyle
The type of material your baking pan is made of can significantly impact the outcome of your baked goods. Metal and glass pans have different heat conductivity, meaning they carry and transfer heat differently. Metal pans are generally better for baking as they heat up quickly and evenly, contributing to a better rise and crispier, browner edges. However, metal pans can negatively react with acidic ingredients, so a glass pan is preferable for recipes with citrus or berries. Glass pans are heavier and slower to heat than metal, but once hot, they retain the heat for longer. This can be advantageous for dishes you want to keep warm after removing them from the oven, such as casseroles or pasta bakes. However, glass pans may not be suitable for intense heat and can be more challenging to store and care for due to their weight and fragility.
| Characteristics | Values |
|---|---|
| Glass pan size | 9 x 9 |
| Glass pan advantages | Non-reactive, see-through |
| Glass as an insulator | Slows the flow of heat |
| Adjusting for glass | Lower oven temperature by 25°F and bake for up to 10 minutes longer |
| Glass pan risks | Chipping, shattering |
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What You'll Learn
Glass pans are insulators, so they slow the flow of heat
Glass pans slow the flow of heat between the oven's air and the batter until the glass itself heats up. Once the glass is hot, it holds onto the heat instead of transmitting it inward. This can result in the outer edges of your bake getting very tall and hard.
The insulating properties of glass pans can also protect the bottom edge of your bake to a degree. This is why glass pans are great for pie crusts—once the glass heats up, it will ensure that the bottom crust gets crisp and golden.
If you are using a glass pan, it is recommended that you lower the oven temperature by 25°F from what the recipe calls for and bake for up to 10 minutes longer. You should also be careful to check that your glass pan is oven-safe. While glass pans are extremely common, they can be a bit risky in the kitchen. Sometimes, glass pans can shatter in the oven for no apparent reason.
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Glass pans retain heat longer than metal pans
Glass pans are heavier and more breakable than metal pans, which makes them more difficult to wash, store, and care for. Metal pans, on the other hand, are usually made from aluminium, which conducts heat more quickly and is easier to wash, store, and care for. This is why glass pans are rarely used in professional kitchens.
Glass pans have a higher specific heat capacity, which means they take more energy and time to heat up and retain heat after being removed from the oven. This can be advantageous for certain dishes, such as fruit cobblers, crisps, and crumbles, as well as savoury casseroles, as the dish can go directly from the oven to the table and remain warm throughout the meal.
However, this same property of glass pans can lead to adverse results for certain recipes, such as brownies or banana bread. The edges may become overcooked before the heat has transferred enough to cook through the centre, resulting in a raw, underbaked, gummy, or sunken centre.
To account for the difference in heat retention between glass and metal pans, it is recommended to lower the oven temperature by 25°F and increase the baking time by up to 10 minutes when using a glass pan. It is also suggested to remove the glass pan from the oven slightly before the baking is completed, as the residual heat will continue to cook the dish.
It is worth noting that glass pans are not ideal for intense heat and do not handle temperature transitions well. For example, taking a glass pan from the fridge and placing it directly into a preheated oven may cause it to crack. Glass pans are also more prone to chipping and shattering, which can be a concern if a chip ends up in the food.
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It's easier to over-bake brownies in a glass pan
Baking in a glass pan is a bit of a gamble. Glass is heavier, pricier, and more breakable than a metal pan, and it conducts heat more slowly. This means that if you're using a glass pan, you'll need to decrease the oven temperature by about 25 degrees Fahrenheit to stop your baked goods from burning.
When it comes to brownies, the type of pan you use can make a big difference in how they turn out. If you're using a glass pan, your brownies may end up underbaked or raw in the centre, with rounded edges instead of the perfectly square slices you might get with a metal pan. This is because metal pans heat up and cool down quickly, resulting in a more even bake and those sharp, aesthetically pleasing edges.
However, if you do decide to use a glass pan for your brownies, be aware that it's easier to over-bake them. This is because glass retains heat better than metal, so your brownies may continue to cook even after you've taken them out of the oven. To avoid over-baking your brownies in a glass pan, it's best to check on them a few minutes early and be prepared to take them out of the oven as soon as they're done.
Additionally, because glass heats up and cools down slowly, you may need to bake your brownies for a little longer than you would in a metal pan. This can be tricky, as the outside of your brownies may end up overbaked by the time the centre is cooked through. It's a delicate balance, but with a little practice and patience, you can successfully bake brownies in a glass pan. Just be sure to keep an eye on them and adjust your baking time as needed.
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Glass pans are non-reactive, so they won't corrode from acidic foods
Glass pans are also a good choice for cooking with alkaline ingredients. Stainless steel pans are another example of non-reactive cookware, but they are relatively poor heat conductors. Manufacturers may line the bottom of stainless steel pans with copper or aluminium to improve their conductivity, but this makes them reactive. Tin-lined pans are another good option, as tin does not react with food.
Glass pans are a common choice for baking, but they do come with a risk of shattering or chipping in the oven. To reduce this risk, it is recommended to let glass pans cool down completely before washing them, as temperature shock can damage them over time. When cleaning glass pans, avoid using abrasive brushes or cleaners, and simply use dish soap or baking soda with water.
If you are using a glass pan for baking, it is recommended to lower the oven temperature by 25°F from what the recipe calls for, and bake for up to 10 minutes longer. This adjustment accounts for the different heat conduction properties of glass compared to metal pans.
In summary, glass pans are non-reactive and suitable for cooking with acidic and alkaline ingredients. They are a common choice for baking but come with a risk of shattering or chipping, so proper care is important to maintain their quality over time.
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Glass pans are great for pie crusts as you can see through them
Glass pans are a great option for baking pie crusts. They are relatively inexpensive and lightweight, making them a good choice for those just starting to build their cookware collection. Glass pans are also great for checking the doneness of your pie crust. Since you can see through them, you can simply look and see if the crust and sides are turning golden brown.
Glass pans heat up gently and evenly, priming the pie for a consistent bake. However, glass pans take longer to conduct heat compared to metal, so you may not achieve as much browning on the bottom and sides of your crust. This is where the clear material comes in handy, especially for fruit pies that can bake for a long time without the filling being adversely affected. You can visibly check how brown your crust is getting and adjust your baking time accordingly.
It's important to note that glass pans retain heat longer than metal pans, so once they're hot, they stay hot for longer. This means that your crust will continue to bake even after you've taken it out of the oven. This can be advantageous if you're looking for a darker crust, as the glass-baked crust will be darker than a metal-baked one.
When using a glass pan, it's recommended to lower the oven temperature by 25°F from what the recipe calls for and bake for up to 10 minutes longer. This will help ensure that your crust doesn't get overcooked or burnt.
While glass pans are a great option for pie crusts, they do have some drawbacks. Glass is always a bit of a risk in the kitchen, as it can shatter or break in the oven. Additionally, glass pans are not suitable for recipes that require quick temperature changes, such as going from the freezer to the oven. If you're looking for a pan that can withstand rapid temperature changes, metal might be a better option.
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Frequently asked questions
It is not recommended to use old glass pans for baking, as they may shatter in the oven. If you do decide to use an old glass pan, ensure that it is oven-safe and lower the oven temperature by 25°F.
Glass pans are non-reactive, meaning they won't corrode from acidic ingredients and won't change the flavour of your bakes. They are also great for monitoring the colour of your bakes, as you can see through them.
Glass pans are insulators, meaning they take longer to heat up and retain heat for longer. This can lead to over-baking and a harder exterior. Glass pans are also not ideal for intense heat and extreme temperature changes.
Metal pans are generally the best option for most baking recipes as they heat up quickly and evenly, and cool down rapidly once removed from the oven. Light-coloured metal pans with shiny finishes are preferable, as darker pans can cause over-browning.
