01 - Arrange bacon slices in a large skillet set over medium heat. Cook, turning occasionally, until crisp and golden on both sides. Transfer bacon to a plate lined with paper towels to drain.
02 - In a mixing bowl, blend together mayonnaise, Dijon mustard, lemon juice, salt, and pepper until smooth and well combined.
03 - Lay each tortilla flat on a clean surface. Evenly spread a thin layer of dressing over the surface of each tortilla.
04 - Distribute chopped romaine lettuce, tomato slices, and 2 slices of cooked bacon onto each wrap. Add avocado and red onion if desired.
05 - Fold in the sides of each tortilla, then roll up tightly from the bottom to encase the fillings securely.
06 - Wrap each assembled BLT wrap tightly in parchment paper or foil. Refrigerate for up to 3 days.