Whisk together the mayonnaise, sour cream, and lime juice in a large bowl.
Add the minced chipotle pepper and adobo sauce. Add more adobo sauce for extra heat.
Whisk in the sugar, salt, and garlic powder until the dressing is smooth and well combined.
Add the shredded green cabbage and toss until evenly coated.
Add the red cabbage, cilantro, and green onions.
Gently toss everything together until the vegetables are evenly distributed.
Refrigerate for a few hours before serving if desired, allowing the flavors to blend
Serve chilled with fish or shrimp and warm tortillas.