Although I realize this post is now over two years old, I'll leave a response in case someone else is searching for the same answer.

If you try to cut the bread immediately after it comes out of the oven, it is may fall apart, unless you treat it with kid gloves. It would be best if you could completely cool the corn bread before slicing, and even then, you'll need to use a sharp serrated knife, and hold the bread as you cut, supporting the bread.

However, if you can afford to wait, overnight refrigeration will firm up the loaf, which can then be sliced perfectly. Then, into the toaster oven, and all is well. Even better, slice the entire loaf after it has been refrigerated, then wrap each slice in a sheet of wax paper, then freeze in a container or additional freezer protection method.

If you are going to use a suction-type freezer method, be sure to freeze the slices completely before placing them into the suction bag.

Hope this helps.