Prepare the ingredients: Dice the red onion, chop the spinach, and separate the egg whites from the yolks.
Cook the filling: Cook the red onion and spinach in a large frying pan until softened. Pour in the egg whites and cook until set, then fold in the feta cheese.
Assemble the wraps: Divide the cooked egg mixture between the two flour tortillas. Top with roasted red pepper slices, then roll the wraps tightly.
Grill the wraps: Heat a little olive oil in a hot frying pan and grill the wraps seam-side down first to help them stay closed. Continue cooking until golden and crisp on both sides.