Creating French Dip Tortilla Roll Ups is a breeze if you follow these simple steps:

1. Prepare the Au Jus: In a small saucepan, combine beef broth, Worcestershire sauce, and Dijon mustard. Heat over medium until warmed through, stirring occasionally. Season with salt and pepper to taste.
2. Lay Out the Tortillas: Place each tortilla on a clean surface or cutting board.
3. Layer the Ingredients: On each tortilla, layer thinly sliced roast beef evenly, followed by a sprinkle of provolone and mozzarella cheese.
4. Roll Them Up: Starting at one edge, carefully roll each tortilla tightly to enclose the filling. Ensure they are secure to prevent any ingredients from falling out.
5. Heat the Roll Ups: In a large skillet over medium heat, add a little oil. Once hot, place the roll-ups seam-side down in the skillet. Cook for about 2-3 minutes per side or until golden brown and crispy.
6. Slice and Serve: Once cooked, remove from the skillet and let them cool slightly. Slice each roll-up into bite-sized pieces.
7. Serve with Au Jus: Arrange the roll-ups on a serving platter with a small bowl of the prepared au jus for dipping.

These steps will guide you in creating these amazing roll-ups effortlessly.