In a large mixing bowl, combine flour, the 3 tablespoons sugar, cinnamon, baking powder, and salt. Cut in butter until mixture resembles coarse crumbs. Stir in nuts.
In a small mixing bowl, combine 2 eggs, and the 2/3 cup cream. Add to flour mixture and stir until just moistened.
Using a 1/4-cup ice cream scoop, scoop dough, and place on an ungreased or parchment-lined baking sheet. Dont flatten.
Combine the egg yolk and 1 tablespoon whipping cream. Brush over the top of the scones. Sprinkle some additional sugar over the scones.
Bake in a 375 degree F oven for 15 minutes or until scones are golden. Remove from baking sheet. Cool on wire rack 5 minutes; serve warm.