1Heat the vegetable oil in a large skillet over medium-high heat. Pour in the jar of salsa roja and the chicken broth, and simmer for 4 to 5 minutes, stirring now and then, until slightly thickened.
2Add the tortilla chips and fold gently for 1 to 2 minutes, just until coated and starting to soften at the edges but still with some crunch.
3Use a spoon to make 8 small wells in the chips and crack an egg into each. Cover the skillet and cook over medium-low heat for 4 to 5 minutes, until the whites are set and the yolks are done the way you like.
4Scatter with cotija, red onion and cilantro, then dollop on the sour cream. Serve straight from the skillet with avocado slices and lime wedges.