01 -
Combine mixed berries, granulated sugar, lemon zest, and cornstarch in a bowl. Stir to coat evenly and set aside.
02 -
In a separate bowl, whisk together flour, granulated sugar, baking powder, and salt until well blended.
03 -
Grate frozen butter into the dry mixture and gently combine with a fork or your fingers until it resembles coarse crumbs.
04 -
Mix vanilla extract into heavy cream. Pour into the flour mixture and stir just until combined. Do not overmix.
05 -
Transfer berry mixture to a baking dish. Scoop biscuit dough over the top and flatten slightly with a spoon.
06 -
Brush biscuit tops with extra cream and sprinkle with sanding sugar if using. Bake at 375°F for 40 to 50 minutes until golden and bubbly.
07 -
Let the cobbler rest 10 to 15 minutes before serving warm with ice cream or whipped cream.