Order › Mushroom + Swiss Sourdough Loaf Image 1 of 1 Mushroom + Swiss Sourdough Loaf $16.00 Ingredients: Sourdough Starter, All Purpose Flour, Bread Flour, Water, Salt, Mushrooms, Swiss Cheese. Style: Sandwich Loaf Round Rustic Loaf Add To Cart Added! Ingredients: Sourdough Starter, All Purpose Flour, Bread Flour, Water, Salt, Mushrooms, Swiss Cheese.