German Vegan Cheese Spaetzle - Bianca Zapatka

Name: German Vegan Cheese Spaetzle - Bianca Zapatka
Cuisine: European, German
Ingredients: 3 cups + 1 tbsp all-purpose flour or pasta flour; ⅓ cup semolina flour or more all-purpose flour; ½ cup potato flour also called "potato starch"; 1 ½ tsp olive oil or canola oil; 1 tsp salt; ¼ tsp turmeric optional for yellow color; 2 cups + 2 tbsp soy milk or other unsweetened non-dairy milk; 1 recipe vegan cheese sauce; 5 onions sliced; 17,6 oz mushrooms sliced; 2 tbsp oil for frying; salt and pepper to taste; To Garnish (optional); vegan parmesan; fresh herbs e.g. parsley, thyme or basil