Stir together the olive oil, onion and garlic in large microwave-safe glass bowl or 13 x 9-inch microwave-safe glass baking dish. Microwave, uncovered, on high power for 4 minutes or until the onion is slightly softened.
Stir in the thyme, salt, pepper, artichokes, tomatoes, tomato paste, olives and vinegar until well blended. Microwave, uncovered, on high power for 6 minutes, stirring the mixture once halfway through the cooking.
Stir the chicken chunks into the sauce in the dish. Microwave, uncovered, on high power for 10 minutes, stirring halfway through the cooking. Let stand for about 3 minutes.
Serve chicken over cooked orzo. Toss with 1/4 cup Parmesan. Garnish with 2 tablespoons Parmesan.