Start by cutting the chicken breasts into small, bite-sized pieces.
In a frying pan, cook the chicken over medium-high heat until it's no longer pink inside, and the outside is slightly browned.
While the chicken is cooking, prepare the smoothie mixture. In a blender, combine the yogurt, spinach, basil, mint, lemon juice, minced garlic, salt, and pepper. Blend until smooth.
After cooking the chicken, allow it to cool for a few minutes.
In a large bowl, combine the cooked chicken and the smoothie mixture. Mix until the chicken pieces are well-coated with the smoothie.
Chill the Chicken Smoothie in the refrigerator for about 30 minutes before serving.