Ingredients

1. 2 cups all-purpose flour
2. 1/4 cup plus 1 tablespoon sugar, divided
3. 1 teaspoon baking powder
4. 1/2 teaspoon baking soda
5. 1/2 teaspoon ground cinnamon
6. 1/4 teaspoon salt
7. 1 cup finely chopped toasted walnuts
8. 4 tablespoons cold unsalted butter, cut into 1/4-inch cubes
9. 1 cup sour cream
10. 1/4 cup plus 1 tablespoon heavy whipping cream, divided

Directions

1. Preheat oven to 425°. Line a baking sheet with parchment paper or a silicone pan liner; set aside.In a large bowl, sift together flour, 1/4 cup sugar, baking powder, baking soda, cinnamon, and salt. Add walnuts, stirring to combine. Add butter to flour mixture. Using a pastry blender, cut in butter until mixture is crumbly.
2. In a small bowl, stir together sour cream and 1/4 cup whipping cream. Add to flour mixture; stir well. Divide dough into 6 equal portions and place 2 inches apart on prepared baking sheet. Brush tops with remaining 1 tablespoon whipping cream and sprinkle with remaining 1 tablespoon sugar.
3. Bake for 18 to 20 minutes, or until lightly browned.