01 -
In a nonstick pan over medium heat, scramble egg whites with spinach until eggs are set and spinach is wilted.
02 -
Layer scrambled egg and spinach mixture and the feta cheese evenly between two slices of whole wheat bread. Top with the remaining bread slices to form sandwiches.
03 -
Spread unsalted butter over the outer sides of each sandwich. Place in a preheated nonstick pan and cook on both sides until bread is golden and crisp and cheese is warmed through, about 3–4 minutes per side.