Season the chicken breast with salt, pepper, and paprika.
Cook in a skillet over medium heat for 4–5 minutes per side until fully cooked (165°F internal temp). Slice thinly.
Lightly toast the English muffin in a toaster or skillet.
Heat a non-stick skillet over medium heat with olive oil or cooking spray.
Pour in egg whites, season with salt/pepper, and cook without stirring until set (2–3 minutes). Fold into a muffin-sized shape.
Place the cooked egg whites on the bottom muffin half.
Add the sliced chicken and cheese, then top with the other muffin half.
Enjoy immediately while the cheese is melty!