In a bowl, mix flour and salt, then add chilled butter and blend until crumbly.
Gradually add cold water to form a dough.
Wrap the dough in plastic wrap and chill for 30 minutes.
Preheat your oven to 375°F (190°C).
In a skillet, sauté onions and bell peppers until soft.
Add cooked ground meat to the skillet and mix well.
Roll out the dough on a floured surface to about 1/8 inch thick.
Cut circles using a large glass or cutter.
Place a spoonful of the filling onto one half of each circle.
Fold the dough over the filling and crimp the edges to seal.
Brush each empanada with egg wash and place on a baking sheet.
Bake for 25 minutes or until golden brown.