Place frozen spinach in a 10-cup shallow microwave-safe
casserole; sprinkle with instant chicken broth; cover with wax paper.
Defrost in microwave oven ten
minutes, rotating dish and stirring
once; drain well.
Stir in sour cream and cayenne.
Arrange artichoke hearts and crab on top.
Dot with butter and cover again with wax
Microwave on high 5 minutes, or until heated through.