Begin by cutting the boneless, skinless chicken breasts into 1-inch cubes and placing them in a large mixing bowl. Season the chicken pieces generously with salt and pepper.

In another bowl, combine 2 tablespoons of olive oil with the minced garlic cloves. Mix well and then pour this vibrant marinade over the seasoned chicken cubes. Toss the chicken until every piece is well coated.

Preheat your grill to medium-high, aiming for a temperature around 400°F, and clean the grates thoroughly.

Carefully arrange the marinated chicken cubes on the grates, cooking for 5-7 minutes on each side until golden-brown and reaching an internal temperature of 165°F.

While the chicken is grilling, prepare the sauce by mixing 1 cup of sour cream, ½ cup of Parmesan cheese, the remaining minced garlic, and ¼ cup of parsley until smooth.

Toss the grilled chicken bites in the creamy Parmesan sauce while they are still hot and serve immediately.