Poach the chicken breast in simmering water for 18 to 20 minutes until it reaches 165°F / 74°C at the thickest part, then let it cool completely.
Dice the cooled chicken into bite-size pieces and place in a large mixing bowl.
Whisk together the mayonnaise, sour cream, honey, black pepper, and salt in a small bowl until smooth.
Add the dressing, grapes, and pecans to the chicken and toss gently until everything is evenly coated.
Chill for at least 15 minutes before serving on croissants, in bowls, or with crackers.