I'm making a french onion "soup" green bean casserole for a banquet. I need to carmelize the onions, going to use frozen green beans(thawing now), and the typical white sauce.
Can I mix it all ahead of time then just pour in a dish to cook at 6pm? I will keep everything separate until mixing time then just put it in together to cook just before we have to go.(45min anyway)
Will this mess up the onions or the white sauce?(no cheese in sauce)
here is what I'm making foodwishes's Channel - YouTube