Heat oven to 400ºF.
Heat a frying pan with oil, 4 turns of the pan, over medium-high heat. Fry tortillas to golden and crisp then salt.
Spray 2 8-inch cake pans with cooking spray.
Beat eggs with salt and pepper, and divide the mixture between the cake pans. Stir in tortillas, dividing them evenly between pans. Bake until golden and cooked through, 20-25 minutes.
Combine tomatoes with half the jalapeños, half the onions and cilantro; season with salt.
Salt remaining red onions and add the juice of 2 lemons or limes, let stand 10 minutes. Add avocados, remaining cilantro and jalapeño peppers, garlic and mash to combine.