Preheat oven to 475°F Line two baking sheets with parchment paper.
Whisk together the heavy cream and yogurt to soft peaks. Set aside
Combine flour, sugar, baking powder, salt, and baking soda.
Cut 6 tbsp butter into ¼ inch cubes and toss into the flour mixture.
Using your hands, rub butter into the flour mixture. The texture will be like damp sand.
Fold the whipped cream and yogurt mixture into the butter-flour mixture. Continue until no dry flour remains.
Knead the dough to a shaggy consistency.
Place dough onto a lightly floured surface and divide into thirds.
Form each third into squares that are about ¾ inch thick.
Cut each square into 4 pieces and place onto the parchment-lined baking sheets.
Melt remaining 2 tbsp butter and brush onto tops of biscuits.
Place baking sheets in oven and reduce temperature to 425° F.
Rotate pans halfway through baking time.
Bake until the biscuits are golden brown on top and bottom, about 15-18 minutes.
Remove from the oven and cool for 10 minutes.