1. Preheat the oven to 375 degrees.
2. In a bowl, mix together the chicken, spinach, cheese, salt, ground pepper, garlic powder, and cajun seasoning. Mix well to combine.
3. Put a heaping teaspoon of filling on one side of the dough, fold the other half of the dough over, and crimp with a fork.
4. In a small bowl, mix the egg and water together. Brush the egg wash over each empanada and bake in the oven for 25 minutes or until golden brown. Serve with the cilantro chimichurri.