In a bowl, toss the chicken cubes with olive oil, paprika, garlic powder, salt, black pepper, and cayenne pepper if using.
Thread the seasoned chicken onto skewers.
Grill the Chicken:
Place the chicken skewers on the grill and cook for about 8-10 minutes, turning occasionally, until the chicken is cooked through and has nice grill marks.
Creamy Garlic Sauce:
In a small bowl, mix together 1/2 cup mayonnaise, 2 cloves minced garlic, 1 tablespoon lemon juice, 1/2 teaspoon salt, and 1/4 teaspoon black pepper.