PREHEAT oven to 375°F. Mix flour, 1/2 cup of the sugar, the baking powder and salt in large bowl. Cut in butter with pastry blender or 2 knives until mixture resembles coarse crumbs. Add 3/4 cup of the milk, the egg and lemon peel; stir just until mixture forms dough. Stir in blueberries and chocolate chunks.
DIVIDE dough in half. On lightly floured surface, pat each half into a round, 9 inches in diameter and 1 inch thick. Cut each round into 8 wedges. Place wedges on ungreased baking sheet. Brush tops with remaining 2 Tbsp. milk; sprinkle with remaining 2 Tbsp. sugar.
BAKE 25 min. or until golden brown. Serve warm or at room temperature.