Cook bacon in the oven according to the instructions here. Pat with paper towels and allow to cool slightly. Chop or crumble the bacon into small pieces.
If using the optional corn tortillas, reduce the oven temperature to 375 degrees F (191 degrees C). Cut the tortillas into thin, 2-inch long strips. Place spaced apart on a parchment-lined baking sheet. Lightly spray the tortilla strips with non-stick cooking spray and a light sprinkle of salt. Bake tortilla strips for about 10 minutes, or until lightly browned and crispy.
Arrange the chopped lettuce on a large serving platter or individual plates.
Top the lettuce with tomatoes, then bacon, eggs, chicken, cheese, corn and beans (if using), avocado, and tortilla strips.
Drizzle ranch dressing and BBQ sauce over the salad. Sprinkle chives on top, if desired.