→ Base Ingredients
                    
                      
                        01 - 
                        Medium onion (1, chopped small)
                      
                    
                      
                        02 - 
                        Fresh spinach (4 cups, loosely packed)
                      
                    
                      
                        03 - 
                        Garlic cloves (2, finely chopped)
                      
                    
                      
                        04 - 
                        Extra virgin olive oil (1 tablespoon)
                      
                    
                      
                        05 - 
                        Jumbo pasta shells (12-14 pieces)
                      
                    
                  
                    → Cheesy Mixture
                    
                      
                        06 - 
                        Parmesan cheese (½ cup, grated, plus extra as needed)
                      
                    
                      
                        07 - 
                        Ricotta cheese (1 cup, full fat preferred)
                      
                    
                      
                        08 - 
                        Mozzarella cheese (1 cup, shredded)
                      
                    
                      
                        09 - 
                        Large egg (1, lightly whisked)
                      
                    
                  
                    → Flavorings and Sauce
                    
                      
                        10 - 
                        Salt (½ teaspoon, more to taste)
                      
                    
                      
                        11 - 
                        Pepper (½ teaspoon)
                      
                    
                      
                        12 - 
                        Marinara sauce (1½ cups, store-bought or homemade)
                      
                    
                      
                        13 - 
                        Fresh basil (optional, for garnish)