Add the mayonnaise, sour cream, chipotle peppers, adobo sauce, lime juice, garlic powder, and cumin to a blender or food processor.
Blend on high for 20–30 seconds until completely smooth and creamy. Scrape down the sides as needed.
Taste and adjust — add more chipotle for heat, more lime juice for brightness, or salt to balance.
Transfer to a jar or squeeze bottle and refrigerate for at least 10 minutes before serving.
Notes
Use 2 chipotle peppers for medium heat, 3 for bold. Remove seeds for milder flavor. This sauce doubles as a dip, a burger spread, or a taco drizzle. Store in an airtight jar in the fridge for up to 10 days.