Make It
Step 1
Preheat oven to 325° F.
Step 2
Beat butter and sweetened condensed milk in large mixer bowl until creamy. Add egg yolks; beat until smooth. Gradually beat in flour. Refrigerate dough for 30 minutes.
Step 3
Shape dough into 1-inch balls; roll in chopped nuts. Place on ungreased baking sheets. Make indentation in center of each cookie with thumb. Fill each indentation with about 1/4 teaspoon marmalade.
Step 4
Bake for 15 to 16 minutes or until edges are lightly browned. Let stand for 1 minute; remove to wire racks to cool completely.
