01 -
In a large mixing bowl, combine berries, granulated sugar, cornstarch, and lemon zest. Stir gently until the berries are fully coated. Transfer to a greased 9×13-inch baking dish.
02 -
In a separate bowl, whisk together flour, sugar, baking powder, and salt. Grate frozen butter into the dry ingredients. Use fingers or a fork to incorporate the butter until the mixture resembles coarse crumbs.
03 -
Stir heavy cream and vanilla extract together. Pour into the flour mixture and mix just until combined. Do not overmix.
04 -
Scoop mounds of biscuit dough onto the berry mixture, slightly flattening each one. Brush the tops with additional cream and sprinkle with sanding sugar if using.
05 -
Bake in a preheated oven at 375°F (190°C) for 40 to 50 minutes, or until the biscuits are golden and the filling is bubbling. Tent with foil if browning too quickly.
06 -
Let cobbler rest for 15 minutes before serving to allow the filling to thicken. Serve warm or at room temperature with ice cream or whipped cream.