Adapted from 
                        Microwave Cooking Lite
                    
                
                
            
                
                    
                            - 
                                  10     ozs         
                                frozen spinach, chopped
                            
 
                            - 
                                   6     ozs         
                                fat-free plain yogurt
                            
 
                            - 
                                   1 1/8 ozs         
                                vegetable soup mix
                            
 
                            - 
                                     1/8 tsp         
                                salt
                            
 
                            - 
                                  36     whole
                                celery stalks, cut into 2" pieces
                            
 
                    
                 
             
            
Place spinach in a 1-quart glass casserole dish. Cover and microwave on high for two minutes, or until tender, stirring twice during cooking time. Drain well. Add yogurt, soup mix, and salt. Mix well and cool slightly. Spread a rounded tablespoon of mixture onto each celery piece. Chill all celery pieces for several hours before serving.