First, heat the olive oil in a large skillet over medium-high heat. Add the ground beef, minced serrano chile, cumin, cinnamon, allspice, smoked paprika, salt, and pepper. Cook for about 8 minutes, using a spoon to break up the meat until it is browned and cooked through.
Next, add the golden raisins and fresh lime juice to the skillet. Bring the mixture to a boil and cook for about a minute, or until most of the liquid has evaporated. Remove the skillet from the heat and stir in the sour cream and quartered black olives. Allow the filling to cool completely before assembling the empanadas.
In a food processor, combine the all-purpose flour, corn flour, baking powder, and salt. Pulse a few times to mix. Add the cold, cubed butter and pulse about 20 times until the mixture looks like coarse cornmeal. In a separate bowl, whisk one egg with the cold water, then gradually add this wet mixture to the food processor, pulsing until a soft dough forms. Be careful not to overmix.
Wrap the dough in plastic wrap and let it rest in the refrigerator for at least one hour, or up to a day. When you're ready to assemble, divide the dough in half. On a lightly floured surface, roll out one half of the dough to about 1/8-inch thickness. Use a 4-inch round cutter to cut out six circles. Repeat the process with the remaining dough.
Prepare an egg wash by whisking the remaining egg with a teaspoon of water. Place about two heaping tablespoons of the cooled filling in the center of each dough round and top with a slice of hard-boiled egg. Lightly brush the edges of the dough with the egg wash, fold it over to create a half-moon shape, and press the edges together firmly. Crimp the edges with a fork or by pleating them, then place the assembled empanadas on parchment-lined baking sheets. Cover and chill for at least 30 minutes.
Preheat your oven to 450°F, placing a pizza stone inside if you have one. Brush the chilled empanadas lightly with the remaining egg wash. Bake for 10-15 minutes, or until they are a beautiful golden brown and crisp. Serve them warm.