Guatemalan Empanadas de Manjar de Leche (filled with custard)

Name: Guatemalan Empanadas de Manjar de Leche (filled with custard)
Cuisine: American, Latin American
Ingredients: 1 lb of rice flour or salpor corn flour; 1 lb wheat flour; 12 onz sugar; 1 lb vegetable shortening; ½ teaspoon salt; ½ teaspoon of baking powder; ½ teaspoon of baking soda; 6 medium eggs; 1/ teaspoon achiote or annatto (or a few drops of red food coloring); 1 lt whole milk; 2 cinnamon sticks; 12 onz sugar; ¼ teaspoon salt; ½ cup of cornstarch dissolved in ½ cup of whole milk