Chorizo and Sweet Potato Empanadas

Name: Chorizo and Sweet Potato Empanadas
Ingredients: * 3 potato, peeled and cubed; * 1 lb chorizo sausage, casing removed; * 1 tbsp cooking oil; * 1 onion, chopped; * 4 clove of garlic; * 1 tsp dried oregano; * 1/2 tsp cumin; * 1/2 tsp turmeric powder; * salt and pepper to taste; for the shell:; * 3 c all purpose flour; * 1/2 c butter (1 stick), room temperature; * 2 egg; * 1 tbsp sugar; * 1 tsp salt; * 1/4 c water; * 1/2 tsp baking powder; * 1 egg, beaten with 1 tbsp milk, for egg wash