Ingredients

• 1 large egg , separated, divided
• 0.5 cups butter , softened
• 0.25 cups packed brown sugar
• 1 cup all-purpose flour
• 0.5 teaspoons vanilla extract
• 0.25 teaspoons salt
• 0.25 cups finely chopped walnuts
• 0.67 cups any flavor fruit jam

Instructions

1. 1 Gather ingredients.
2. 2 Preheat the oven to 300 degrees F (150 degrees C). Grease two cookie sheets and set aside.
3. 3 Whisk egg white in a small bowl. Place chopped walnuts in another small bowl.
4. 4 Cream butter, brown sugar, and egg yolk in a mixing bowl until light and fluffy, about 2 minutes.
5. 5 Add flour, vanilla, and salt; mix until well combined.
6. 6 Scoop dough into 1 ½-inch balls. Dip in egg white, then roll in walnuts until coated. Place 2 inches apart on the prepared cookie sheets.
7. 7 Bake in the preheated oven until slightly puffed, about 5 minutes.
8. 8 Remove cookies from the oven. Use your thumb or the end of a wooden spoon to gently press an indent in the center of each cookie. Spoon jam into each thumbprint, filling it to the brim.
9. 9 Return cookies to the oven and bake until set, about 8 minutes.
10. 10 Remove from the oven and transfer to wire racks to cool completely.

Nutrition per serving