• Step 1: In a medium bowl, combine the sour cream, mayonnaise, lime juice, chili powder, cumin, garlic powder, salt, and black pepper. Whisk until the ingredients are fully incorporated and the sauce is smooth.
• Step 2: Taste the sauce and adjust any seasonings as needed, adding more lime juice for tartness, chili powder for heat, or salt and pepper to balance the flavors.
• Step 3: Cover the bowl and refrigerate the sauce for at least 30 minutes to allow the flavors to meld. This can be made up to 3 days in advance.