Toastie bags will not fit in my toaster so, fed up with trying to clean my toastie maker, I bought a microwaveable grill from Lakeland - well worth the £30! It cooks all sorts of things and can be washed in the dishwasher. It browns the food such as bread, sausages, bacon etc by heating the grills empty for 3 mins first, then placing the food in between the plates, squishing them together with elastic catches and cooking again for up to three more minutes. Any grease easily drains into the grill lines.
I've tried cooking a variety of things, and it has all turned out well - I even "grilled" onion slices to go with the hot dogs I made today.