Cook the Simply Potatoes according to the package instructions.
Add the butter, onion, and half the salt, pepper, oregano, and cumin to the potatoes. Cook until onion softens.
Brown the ground beef and add the second half of the salt, pepper, oregano, and cumin.
Add the olives (and raisins if using them) to the ground beef.
Mix cup of water with cornstarch and pour into beef, cooking on medium heat until cornstarch mixture reduces.
Add the potatoes to the ground beef mixture and mix well.
Assemble your empanadas by laying each pastry dough disc flat and adding a spoonful of the meat mixture on top of it. Use your finger to rub a tiny bit of water around the outer edge of the pastry disc and then fold it over and seal the edges with a fork.
Place the empanadas on parchment paper in a large baking sheet and then brush each with beaten egg.