
Add the chicken breast into a saucepan, along with the lightly mashed garlic, bay leaves, and peppercorns, then fill with water to about 1 inch (2.50 cm) above the chicken, season generously with salt, and heat with a high heat
Once it comes to a boil, place a lid on the pan and lower to a low-medium heat, simmer for 10 to 15 minutes or until the chicken is fully cooked through (internal temperature of at least 165 F - 74 C), then remove the chicken breast and transfer to a cutting board
After 2 to 3 minutes, using 2 forks, gently shred the chicken
Add the mayonnaise into a large bowl, along with the Greek yogurt, Dijon mustard, chopped red onion, chopped celery, grated garlic, chopped dill pickles, and chopped chives, then add in the shredded chicken, lemon juice, and season with salt & pepper, mix together until well mixed
Lightly toast the slices of sandwich bread
To assemble the sandwiches, add two slices of tomato over the bottom slice, top off with a generous portion of the chicken salad, add some chopped lettuce, and add another slice of toast, enjoy!