Cut chicken breasts into medium-sized cubes.
Place the cubed chicken and the marinade ingredients into a small bowl, mix, cover with plastic wrap, and refrigerate for 2 hours.
Preheat indoor or outdoor grill to 400°
When chicken is fully marinated, slide the cubes onto long skewers leaving a small bit of room between each piece so the chicken cooks on all sides.
Place skewers on grill and grill for 20 minutes, flipping at the 10-minute mark. Watch them for doneness starting at 15 minutes as all grills are different.
While the chicken is marinating make the whipped feta.
Place the feta, yogurt, and pepper into a food processor or blender and blend until smooth.
You may need to scrape down the side of the bowl 2-3 times during the blending process.
Transfer the mixture to a small bowl and stir in 1 teaspoon of the sun-dried tomato juice from the jar.
Cover with plastic wrap and refrigerate until ready to use.