For the sandwich: Toast the bread in an oven or a hot dry pan. You could also grill it, the char would add a nice flavor to the sandwich.
In a large skillet, heat the oil and sear the slices of tortilla, gently flipping with a spatula until golden brown and crispy, about 1 minute per side.
Spread a generous dollop of the aioli on the buns and place 2 slices of crispy tortilla on each. Top with some marinated peppers, garnish with the arugula. Close the sandwich with the top bun and serve.