For each enchilada, spread 1/4 cup beans down center of tortilla. Top beans with 1/4 cup cheese. Fold 2 sides of tortilla up over filling; starting at bottom, roll up tortilla in enclose filling. Place 2 enchiladas in each of 2 shallow microwavable bowls or on each of 2 microwavable plates.
Top each serving with 1/4 cup enchilada sauce; sprinkle each with remaining cheese.
Microwave each serving on High about 2 minutes or until cheese inside enchiladas is melted. Top each serving with sour cream and onions before serving.