HEAT oven to 425°F.
COMBINE baking mix, cheese and herbs in large bowl. Mix sour cream and mustard in small bowl. Gradually stir in milk. Add to baking mix mixture; stir just until moistened.
PLACE dough on surface lightly dusted with additional baking mix; knead 10 times. Pat into 1/2-inch-thick circle. Cut with 2-inch biscuit cutter dusted with baking mix. Place biscuits, 2 inches apart, on baking sheet. Brush lightly with egg; top with parsley. Brush with remaining egg.
BAKE 12 to 15 min. or until lightly browned. Serve warm.