Pour baking mix into mixer or food processor. Add cold butter until it becomes course crumb texture.
Add liquid ingredients into the dry ingredients and pulse until just combined.
Toss cranberries in flour and gently fold into the dough.
Shape batter into a 8" round disk and place in refrigerator for 15 minutes to overnight.
Place parchment or silicone baking mat on baking sheet Use sharp bench scraper to cut into 8 triangles. Separate out pieces and brush heavy cream and course sanding sugar on top.