Prepare the dough.In a large mixing basin, add flour and salt.Add the cold butter and stir until it resembles coarse crumbs.In a small bowl, whisk the egg and add it to the flour mixture.
Gradually add the cold water and stir until a dough forms.Knead the dough on a lightly floured surface until it's smooth.
Wrap the dough in plastic wrap and chill for at least 30 minutes.
Make the filling.Cook the ground beef or chicken in a pan over medium heat until it is browned.
Drain any extra fat.Cook the onions, garlic, and red bell pepper in the skillet until softened.
Combine the cumin, paprika, salt, and black pepper.Combine the green olives, raisins (if using), and hard-boiled eggs.Remove from heat and add the fresh parsley. Let the filling cool.
Prepare the Empanadas: Preheat the oven to 375°F (190° C).On a floured surface, roll the dough to a thickness of about 1/8 inch.
Cut circles with a round cutter or a small bowl.Put a spoonful of filling in the center of each dough circle.
Fold the dough over the filling to form a half-moon shape, sealing the sides with a fork.
Arrange the empanadas on a baking sheet lined with parchment paper.
Step 4: Bake the empanadas. Brush the empanadas with beaten egg to make them golden.Bake for 20–25 minutes, or until golden brown.