Ingredients:

3 tablespoons olive oil
1 1/2 tablespoons red wine vinegar
1 lime, juiced
1 teaspoon chili powder
1/2 teaspoon paprika
1/2 teaspoon onion powder
1/2 teaspoon garlic powder
cayenne pepper to taste
salt and freshly ground black pepper to taste
1 pound skinless, boneless chicken breast halves - cut into 1 1/2 inch pieces

Directions

In a small bowl, whisk together the olive oil, vinegar, and lime juice. Season with chili powder, paprika, onion powder, garlic powder, cayenne pepper, salt, and black pepper. Place the chicken in a shallow baking dish with the sauce, and stir to coat. Cover, and marinate in the refrigerator at least 1 hour.
Preheat the grill for medium-high heat. Thread chicken onto skewers, and discard marinade.
Lightly oil the grill grate. Grill skewers for 10 to 15 minutes, or until the chicken juices run clear.