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                                            Prep Time: 0 Minutes Cook Time: 0 Minutes  | 
                                            Ready In: 0 Minutes Servings: 1  | 
                                         
                                        
                                     
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                    Prep and Cook Time: about 1 1/2 hours. Notes: Oatmeal gives these jam-filled cookies a hearty texture. Store the cookies airtight for up to 2 days. Ingredients: 
                    
                        
                                                1 cup (1/2 lb.) butter, at room temperature  |  
                                                1/2 cup firmly packed brown sugar  |  
                                                1 large egg, separated  |  
                                                1 1/2 teaspoons vanilla  |  
                                                1 cup all-purpose flour  |  
                                                2 cups rolled oats  |  
                                                1 1/2 cups finely chopped walnuts  |  
                                                about 1 cup fruit jam  |  
                                                
                     
                    Directions: 
                    
                        
                            
                                1. In a bowl, with an electric mixer on high speed, beat butter, brown sugar, egg yolk, and vanilla until smooth. Stir or beat in flour and oats until well blended. 2. In a small bowl, beat egg white and 2 teaspoons water to blend. Put walnuts in a shallow bowl. Shape dough into 2-teaspoon-size balls and dip in egg white mixture; shake off excess, then roll in walnuts. Place 1 inch apart on buttered or cooking parchment-lined 12- by 15-inch baking sheets. Press your thumb into the center of each cookie to make a 1/2-inch-deep indentation. 3. Bake cookies in a 300° oven until lightly browned, about 15 minutes; if baking more than one pan at a time, switch pan positions halfway through baking. 4. Carefully fill each indentation with about 1 teaspoon jam (if indentations have disappeared, make them again with the rounded end of a wooden spoon). Return to oven and bake until cookies are golden brown and jam has melted, about 15 minutes longer. With a wide spatula, transfer cookies to racks to cool completely. 5. Note: Nutritional analysis is per cookie.                              | 
                         
                         
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