Quoting SmashleynSmallyPants:" sautee the veggies in the butter then transfer it to a bowl and add the cheddar cheese when its a little cool so you can sort of mold it. Do you have any rice or bread crumbs to bind it together?"
Quoting ^-^ Rawr.:" Cut the breast about half way through, make a pocket. Stuff the pocket with cheese, peppers, and onions. ... [snip!] ... and honey and brown sugar on the outside if you have those, just letting it cook in a deep baking dish until it's done. Yumm."
Quoting Buffy♥:" Nuh uh "
Quoting SmashleynSmallyPants:" the cheese will probably hold it together good enough. "