Preparing the vegetables for cooking. Walla Walla Onion Soup Pacific Northwest soup with famous sweet onions. Print Cook Mode Course: Soup Cuisine: American Prep: 15 min Cook: 35 min Total: 50 min Servings: − 6 + Nutrition per serving 215 Calories 5g Protein 11g Fat Ingredients US Metric 3 lbs Walla Walla onions, sliced 4 tbsp butter 6 cups chicken broth 1/2 cup Washington white wine Fresh thyme Tillamook cheddar Instructions . . . . More Onion Soups Recipes Smoked Onion Soup Leek and Onion Soup Slow Cooker Onion Soup