Preheat oven to 375°F.

Combine the first four ingredients in a medium bowl, stirring with a whisk.

Spray baking sheet with cooking spray.

Combine flour, baking powder, salt in a large bowl, stirring with a whisk. Cut in chilled butter until the mixture resembles coarse meal.

Gently fold in chocolate chips. Add milk mixture, stirring just until moist.

Place dough onto a floured surface and knead lightly four times with floured hands.

Form dough into a 9-inch circle onto baking sheet, about 3/4 inch thick.

Using a knife, cut dough into 12 wedges all the way through.

Brush egg white over dough and sprinkle evenly with sugar.

Bake until golden, about 18-20 minutes. Serve warm.