To prepare your oven, move one rack to the lowest position and place a baking sheet on it to catch the crumbs. If you have three racks, remove one. Take the top rack out and balance it on four overturned glasses so you can work the rack suspended over your workspace, then preheat oven to 375 degrees Fahrenheit (190 degrees Celsius). Wrap foil around two bars so you can work directly on your (likely not toiveled) oven racks.

Crush Doritos and place on a plate. Brush one side of each tortilla with barbecue sauce, then dip them, sauce side down, into the Dorito crumbs. Drape the tortillas over the foil on the oven rack. Return the rack to the oven and bake for 10 minutes.

Meanwhile, brown the ground beef in a large skillet and combine with taco seasoning. Fill the breaded tacos with ground beef, lettuce, tomato, onion, and cilantro, if using. Drizzle with sauce of choice and serve.