1. Combine 2/3 cup milk and coffee granules in a microwave-safe bowl. Microwave on HIGH for one minute, and stir until coffee dissolves. Cover and chill completely. Stir in vanilla and egg. 2. Preheat oven to 425°. 3. Lightly spoon the flour into dry measuring cups; level with a knife. Combine flour, sugar, baking powder, salt, and cinnamon in a bowl, and cut in butter pastry blender or 2 knives until mixture resembles coarse meal. (The flour mixture and butter can also be combined in a food processor; pulse until mixture resembles coarse meal.) Stir in walnuts. Add milk mixture, stirring just until moist (dough will be sticky). 4. Turn dough out onto a lightly floured surface, and knead lightly 4 times with floured hands. Pat the dough into an 8-inch circle on a baking sheet coated with cooking spray. Cut the dough into 10 wedges; do not separate. Brush the dough with 2 teaspoons milk, and sprinkle with 2 teaspoons sugar. Bake at 425° for 20 minutes or until lightly browned. Serve warm.