Walnut Thumbprints

Ingredients (11)

• 1/2 cup butter, softened
• 1 cup packed brown sugar
• 1 egg
• 1 teaspoon vanilla extract
• 1-3/4 cups all-purpose flour
• 1/2 teaspoon baking soda
• 1/4 teaspoon salt
• FILLING:
• 1 cup chopped walnuts
• 1/2 cup packed brown sugar
• 1/4 cup sour cream