Step 1Cook chorizo in large skillet over medium-high heat, breaking it apart with a wooden spoon, until browned, 6 to 8 minutes.
Step 2Add onions and cook just until they start to soften, 2 to 3 minutes. Pour in eggs, reduce heat to medium-low and cook, stirring, until eggs just begin to set, about 2 minutes. Stir in cheese, cilantro and tortilla chips. Cook, stirring, until eggs are set but not dry, 4 to 5 minutes. Serve topped with sour cream.