1 cup butter, softened
½ cups sugar
2 large eggs, separated
½ cup dark corn syrup
2½ cups flour
Filling:
¼ cup plus 2 tbsp confectioners sugar
3 tbsp butter
2 tbsp dark corn syrup
¼ cup plus 2 tbsp finely chopped pecans
In a large bowl, cream butter and sugar until light and fluffy, 5-7 minutes. Beat in egg yolks and corn syrup. Gradually beat in the flour. Refrigerate, covered, until form enough to roll, about 30 minutes.
For filling, in a small saucepan, combine confectioners sugar, butter and corn syrup. Bring to a boil over medium heat stirring occasionally. remove from heat, stir in pecans. Remove from pan; refrigerate until cold, about 30 minutes.
Preheat oven to 375 degrees. Shape dough into 1-inch balls; place 2 inches apart on parchment lined baking sheets. In a small bowl, whisk egg whites; brush over tops.
Bake 5 minutes. remove from oven, Gently press an indentation in center of each cookie with the end of a wooden spoon handle. Fill each with a scant ½ tsp pecan mixture. Bake until edges are light brown, 4-5 minutes longer.
Cool on pans 5 minutes. remove to wire racks to cool.