Heat a large pot of water and bring it to a full boil. Add the raw chicken breasts and reduce heat slightly. Cook for 5 to 8 minutes (depending on thickness of chicken), or until chicken is cooked through. Place chicken on a cutting board, chop into cubes, and allow it to cool.: When the pot hits a full boil you will hear a rolling roar and see vigorous bubbles, which is the ideal starting point to poach chicken . Reducing the heat to a gentle simmer avoids violent movement that can toughen the meat, yielding tender results. After 5 to 8 minutes the surface should appear opaque and the juices run clear, and using a thermometer to confirm an internal temperature of 165 F ensures safety. Let the chicken rest on a board so the juices reabsorb, then chop into even cubes so each bite has consistent texture. A common mistake is overcooking, which leads to dry, stringy pieces, so keep a close eye on timing.
Whisk together the yogurt, mayo, lemon juice, mustard, maple syrup, curry powder, and salt in a large mixing bowl until well-combined.: As you whisk the dressing you will notice a creamy sheen form and the aroma of curry will bloom, which signals the spices are integrating with the acids and fats. The emulsion of yogurt and mayo creates a clingy base that coats the chicken without sliding off, while lemon and mustard brighten the overall taste. Whisk briefly until smooth, then taste and adjust salt or lemon to achieve a lively balance. Avoid overwhisking to the point of thinning the mixture, and do not add too much salt at first since it is easier to add more later than remove it.
Add the green onion, raisins, and grated carrot to the mixing bowl, along with the cooled chopped chicken. Stir well until everything is coated.: When you add the shredded or cubed chicken , you'll feel the dressing envelop the pieces, and the mixture should look cohesive and slightly glossy. The grated carrot contributes bright orange flecks and a crisp counterpoint to tender chicken , while the raisins provide chewy pockets of concentrated sweetness. Mix gently to preserve texture, ensuring the green onion is distributed for bursts of sharpness. One pitfall is overmixing, which can break down the carrot and make the salad mushy, so fold until just combined.
Assemble chicken salad sandwiches using your favorite toppings such as spring green mix, heirloom tomato, and avocado. Enjoy!: For assembly, lay out two slices of sandwich bread , and spread a generous portion of the curried chicken salad in the center so you get a balanced bite of filling and bread. Add slices of heirloom tomato and avocado for juiciness and creaminess, then top with a handful of spring greens for crunch and peppery notes. Press lightly so the sandwich holds together, and if you plan to serve later, wrap tightly to maintain freshness. The most common misstep is overfilling which causes the sandwich to spill, so aim for a neat, manageable amount.