In small saute pan, heat oil or cooking spray. Add egg whites and cook as you would an omelette. Try to keep the eggs fluffy and in a shape that will easily fit in folded flatbread.
Spread 1-1/2 Tbsp Spinach-Feta Spread over flatbread.
Layer on one half of flatbread the cooked egg whites (cut in half as needed to fit), spinach and tomato slices.
Fold flatbread over ingredients to form a sandwich. Serve warm.