1. Thaw spinach in microwave for 3 minutes at 40 percent power. (Edges should be thawed but not warm; center should be soft enough to be broken apart into icy chunks.) Squeeze partially frozen spinach of excess water.

2. In food processor, process spinach, sour cream, mayonnaise, scallions, dill, parsley, garlic, salt, pepper, cilantro, chipotle chiles, lime juice, lime zest, light brown sugar, and cumin until smooth and creamy, about 30 seconds. Transfer mixture to medium bowl; serve. (Dip can be covered with plastic wrap and refrigerated up to 2 days.)