I've been able to use my truck stop 12 volt lunch box cooker pretty effectively as an oven. I've used it to re-heat McD Quarter Pounders, fishsticks, chicken tenders, canned veggies, etc. Roll a couple of lengths of aluminum foil into what looks like a cigar. Make 2 "cigars". Lay them inside the bottom cooking surface of the lunchbox cooker. You want to get your food tem off of the bottom surface of the cooker, or it will just fry the bottom and leave the rest under cooked. Wrap your item in aluminum foil then lay it on top of the "cigars". Cook. For a Qtr Pounder heat for about 15-20 minutes per top and bottom. Enjoy. Right now McDs is selling 2 (Big Macs, Qtr Pounders, Filet o Fish, 10 McNuggets) for 5$. The other chain burger joints have something you probably like. I buy one to eat now and one to keep in the electric cooler for later. The Lunch Box Cooker isn's as fast or versatile as a microwave or toaster oven but it's small and available everywhere. It beats cold food or giving up the space for bigger alternatives. Check out 12vcooking's channel on YouTube for other ideas.
Try the foil pans that fit on the inside of the Burton cooker. Get em from Wally world, cheaper on line. Can of pasta sauce Little sausages Cheese - shredded. Little can of beans Or little can of clams/oysters/salmon/chicken etc. About an hour and you've got a pretty decent little dish. Still have ours - don't need it now, but used it for years.
My inverter quit the other night with fridge full of food so no microwave and won't replace it till I get home . So I bought one those 12 volt road pro crock pots and that thing rocks !
I used the lunch box cooker a lot when I worked for Knight. I made whole meals in that thing. It’s very versatile. There is a guy on YouTube that made videos about all the stuff he made in his. I’d start my meal at my mid shift 30 minute break and, by the time I stopped, dinner was ready.
I think the YouTube guy is 12vcooking. He cooked full meals in the cooker. Everything except eggs turned out very nicely. There are lots of YT videos using this cooker. I still would prefer my old 12 volt Oven, which looked more like a small toaster oven, instead of the lunchbox. It also had a high and low setting. It just gave a larger flat heating surface inside. I routinely cooked the TV dinners that didn't have plastic trays. But that item doesn't seem to be available anymore.
Actually, it is called a lunch box oven, so... Before I had the inverter and a toaster-oven I would even bake potatoes in my lunch box oven. It takes a bit longer, but turns out just as good. (Actually, I guess they call it a stove. I call it an oven because it is enclosed like an oven.)
Still have one, must be 5 years old. Have the microwave as well. Found that not having things directly on the bottom of the unit cooked more even. Depending on what your cooking, adding a small amount of water in the bottom helped.
I used rectangular aluminum roast pans as a insert for my lunch box cooker. Sprayed some Pam in it and it worked great. Made for easy clean up when done.