Preheat oven to 325 degrees. Line baking sheet with parchment paper.
In large bowl, combine flour, 2/3 cup sugar, baking powder and baking soda. Mix well. Using pastry blender, cut in butter until crumbly. Mix in chocolate chips.
In medium bowl, whisk milk, egg yolk, and vanilla extract; add to flour mixture. Mix until dough comes together in moist clumps. Gather dough into ball.
On lightly floured surface, roll dough to 1 inch thickness. Using 2 1/2 inch round cutter, cut scones and place on prepared baking sheet. Brush tops evenly with 2 tablespoons cream and sprinkle with 2 teaspoons sugar.
Bake 20 minutes, or until lightly browned. Serve warm with Strawberry Sweet Cream.