1. Heat olive oil in a large pot over medium heat. Add the diced onion, sliced carrots, and chopped celery. Cook for about 5 minutes, stirring occasionally, until the vegetables are softened and the onion is translucent.
2. Add the minced garlic and cook for 1 minute until fragrant, scraping any bits from the bottom as you go.
3. Add the whole chicken breasts and pour in the chicken broth. Bring to a gentle simmer and cook for 15 to 20 minutes until the chicken is cooked completely through. Check by cutting into the thickest part before removing.
4. Remove the chicken and shred it using two forks into generous, uneven pieces. Return the shredded chicken to the pot.
5. Stir in the chopped butter lettuce and cook for exactly 2 to 3 minutes — set a timer — until silky and wilted but still present in the bowl.
6. Stir in the fresh parsley and season generously with salt and pepper to taste.
7. Serve immediately with a generous squeeze of fresh lemon over each bowl right before eating (if you can wait that long — it smells absolutely beautiful at this point).

Nutrition Information (Per Serving):

• Calories: 220
• Carbohydrates: 10g
• Protein: 28g
• Fat: 8g
• Fiber: 2g
• Sodium: 490mg
• Key vitamins/minerals: Vitamin A (70% DV), Vitamin K (40% DV), Vitamin C (22% DV), Folate (15% DV) Note: Butter lettuce contributes meaningful amounts of vitamins A and K along with folate, making this a genuinely nourishing soup that is as light as it is satisfying.

Notes:

• Add the butter lettuce in the last 2 to 3 minutes only — earlier and it dissolves completely into the broth and loses all its beautiful silky character.
• The fresh lemon squeeze at serving is essential — it brightens every flavor and makes the butter lettuce’s subtle sweetness come forward in the bowl.
• Pull the chicken out as soon as it’s cooked through — leaving it simmering in the broth past the 20-minute mark makes it stringy and dry.
• Shred the chicken into larger, uneven pieces rather than tiny shreds — they stay juicier and have more satisfying presence in the bowl.

Storage Tips:

• For best results, store the soup base without the butter lettuce — refrigerate for up to 3 days and add fresh lettuce when reheating.
• If already combined, refrigerate in an airtight container for up to 2 days and reheat gently on the stovetop.
• Add a splash of broth when reheating since the soup thickens slightly overnight.
• Freezing the soup base without the butter lettuce works well for up to 2 months — add fresh lettuce when reheating from frozen for the best texture.

Serving Suggestions:

• With warm crusty bread or a buttered baguette for the most classically satisfying pairing
• With a simple green salad dressed with a sharp Dijon vinaigrette to complement the soup’s light, clean character
• Over a small scoop of cooked orzo or small pasta placed directly in the bowl before ladling the hot soup over the top for a heartier version
• Finished with a light drizzle of good quality olive oil over each bowl right before serving for a subtle richness that feels elegant

Mix It Up (Recipe Variations):

• Lemon Herb Chicken and Butter Lettuce Soup: Add a whole sliced lemon and a sprig of fresh tarragon to the simmering broth for a fragrant, French-bistro inspired version.
• Spring Vegetable Version: Add fresh or frozen peas and thin asparagus pieces in the last 5 minutes alongside the butter lettuce for a bright, seasonal bowl.
• Creamy Chicken and Butter Lettuce Soup: Stir in a quarter cup of heavy cream right before adding the lettuce for a silky, luxurious finish that feels genuinely special.
• Heartier Cold-Weather Version: Add a cup of cooked orzo or ditalini to each bowl before ladling the hot soup over the top for a more substantial, warming meal.

What Makes This Recipe Special:

Simmering whole chicken breasts directly in the broth rather than pre-cooking them separately allows the meat to release its natural juices into the surrounding liquid, creating a richer, more deeply flavored broth than water-poaching or pan-cooking could provide. Shredding the chicken into generous, uneven pieces rather than fine shreds gives each spoonful substantial texture and ensures the meat stays juicy rather than drying out in the hot liquid. Adding the butter lettuce in the final 2 to 3 minutes only — and finishing with fresh lemon at the table — preserves its silky, sweet character and bright contribution to the bowl, giving this chicken and butter lettuce soup its signature lightness and elegance that makes it unlike any other chicken soup you’ve made before.