I did your Raspberry Cheesecake Brownie, i have a question though, i preheated the oven as you said, when cooking it for an hour do we leave the gas opened or do we shut it off?

Hello there!
Glad you tried making it!
Now the reason we preheat the oven is to make it hot so when we place the item in it, it begins cooking immediately instead of slowly building up. Don’t close the gas, simply preheat the oven and place the brownies in the oven without turning anything of , until the brownies are ready to be removed from the oven!

Hope this helped,
Shaikha xxx