Grilled Steak Fajita Skewers with Avocado Chimichurri

• 2 pounds top sirloin steak cut into 1-inch cubes
• 2 tablespoons olive oil
• 1 tablespoon chili powder
• ¼ teaspoon garlic powder
• ¼ teaspoon onion powder
• ¼ teaspoon dried oregano
• ½ teaspoon paprika
• 1 ½ teaspoons ground cumin
• 1 teaspoon salt
• 1 teaspoon ground black pepper
• 1 red bell pepper cut into 1-inch pieces
• 1 yellow bell pepper cut into 1-inch pieces
• 1 green bell pepper cut into 1-inch pieces
• ½ red onion cut into 1-inch pieces

Avocado Chimichurri

• ⅓ cup olive oil
• 1 avocado
• 3 garlic cloves
• ½ cup chopped fresh parsley
• ½ cup chopped fresh cilantro
• 1 teaspoon salt
• ¼ teaspoon ground black pepper
• 1 tablespoon fresh lime juice