Egg Noodles (Spätzle) with shiitake mushrooms and broccoli in a cheesy sauce

Name: Egg Noodles (Spätzle) with shiitake mushrooms and broccoli in a cheesy sauce
Prep time: 10 min
Cook time: 35 min
Total time: 45 min
Cuisine: German, European
Ingredients: 1 pack fresh egg noodles (cooked) ((approx. 300g/10 oz)); 1 liter water for cooking egg noodles; 4-6 tbsp. olive oil; 3 shallots ((or one red onion, medium)); 200 g shiitake mushrooms ((approx. 7 oz)); 1 medium broccoli head - florets needed ((approx. 400g/14 oz)); 100 g (3.5 oz) sour cream (mascarpone cheese) ((or 150 ml oat cream)); 2 tbsp. all purpose flour, unbleached; 400 ml water/broth; 1 tbsp. all spice (or 1 bullion cube); 2 tbsp. fresh oregano, chopped (for sprinkling); 2 tbsp. sesame seeds (unbleached) (for sprinkling ); 2 tbsp. sesame seeds oil (optional)