Preheat oven to 400°F (200°C). Line a baking sheet with parchment paper.

In a large bowl, whisk together flour, cocoa, sugar, baking powder, and salt. Using a pastry cutter or 2 forks, cut in cold butter until mixture resembles coarse bread crumbs. Add chocolate chips, cream, and milk, and working quickly, stir until a loose dough forms.

Turn out dough onto a lightly floured surface, and knead a few times just until dough holds together. Pat into a 1-inch-thick circle. Cut dough into 8 wedges, and place on prepared pan. Refrigerate for 15 minutes.

Bake until tops are firm and scones sound hollow when tapped, 25 to 30 minutes. Let cool on pan for 10 minutes. Remove from pan, and let cool completely on a wire rack.

Drizzle Chocolate Glaze onto cooled scones, and let set before serving. Store in an airtight container for up to 3 days, or freeze in an airtight container for up to 2 months. Let frozen scones thaw at room temperature for 1 to 2 hours.