The Veggie Prep: In a large mixing bowl, combine your shredded cabbage, carrots, cilantro, and green onions. Toss them gently so the colors are evenly distributed.

Whisk the Dressing: In a separate small bowl, whisk together the mayonnaise, lime juice, vinegar, sugar, cumin, salt, pepper, and chili powder (if using). Whisk until the dressing is smooth and the sugar has dissolved.

The Coating: Pour the dressing over your vegetable mix.

Toss Thoroughly: Use large spoons or tongs to toss the slaw until every strand of cabbage is evenly coated in that zesty cream.

The "Flavor Meld": This is the secret step! Refrigerate for at least 30 minutes. This allows the vinegar and lime to slightly tenderize the cabbage and lets the flavors harmonize.

Final Toss: Give it one last stir before serving. Taste and add a final pinch of salt or a squeeze of lime if needed.