In a 5- to 6-quart Dutch oven cook pancetta until browned. Remove pancetta, reserving 2 tablespoons drippings in pan (add olive oil if necessary to equal 2 tablespoons). Drain pancetta on paper towels; set aside. Cook chicken in drippings about 10 minutes or until light brown, turning to brown evenly; drain off fat. Add undrained tomatoes, orzo, garlic, and 1 cup water. Bring to boiling; reduce heat.
Simmer, covered, 25 to 30 minutes or until chicken is no longer pink (180 degree F) and orzo is tender. If necessary, cook, uncovered, 2 to 3 minutes or until sauce is desired consistency. Stir in pancetta, olives, and basil; heat through. Divide spinach among 6 plates. Top each with a thigh, some of the orzo mixture, and some of the cheese. Makes 6 servings.