A pro does this fast and knows his/her way around Photoshop.
How to clean up the background:
How to make it pure white:
HOWEVER, if you want to avoid a lot of editing, I suggest you don't buy any pre-made box that will be full of imperfections, wrinkles/creases, and could be any sort of material.
https://www.henrys.com/72954-SAVAGE-53I ... WHITE.aspx
Notice here, he's not using a fancy camera or materials. He's got foamboard on his table, and instead of a box, he's working in a white room, and he's got a form of white seamless as his backdrop.
As I mentioned, it's mainly technique, importantly lighting and editing.
https://www.currys.com/catalogpc.htm?Ca ... rce=Search
When you use artificial lighting like above, you need to correct white balance eg; turn warm yellow light to whiter, see 4:50 mark. It's more work, you have to shoot in RAW and do additional editing because RAW files are dulled down but contain lots of info (adjust contrast, black level, colour saturation etc) it's fine for product photography but imho, it looks sterile if you are trying to sell delicious cookies.
When you use natural window light like Steve Hansen, you less likely need to correct white balance, and the images look more organic and inviting. You can easily shoot in jpg, good for a beginner, and do even less editing.
When you are that close doing photography, you should wear black. Everything reflects, if you wore a bright red shirt, it would reflect and cast redness forward if you are close enough to the food.
White reflects light, black absorbs it. Notice here Andrew Scrivani is using window light (organic), absorbing the light with black on the right. and dressed in all black.
The best window light is a cloudy day or put a piece of white sheer in front of it, no direct sunlight.
https://www.creativelive.com/class/food ... w-scrivani
ReStore (Habitat for humanity) sells leftover boxes of hardwood, I use them as backdrops for newborn photography, you can easily click together, same as what he's using underneath the cutting board. It's a good place to buy props and background material.