The Chicken Poppers sandwich features spicy Zinger chicken breast fillet pieces alternating with two Poppers on a grilled sub sandwich bun. The sandwich also contains cheddar cheese and spicy mayo.
The KFC Royal Poppers sandwich is similar but on a round sesame bun with two spicy Zinger chicken strips, one Popper, lettuce, and spicy mayo.
I'm not exactly sure jalapeno poppers work inside a sandwich, since I sometimes find myself pulling the jalapeno out accidentally when eating them, but I guess onion rings are kind of the same.