Winter Berry Cobbler

FOR THE FILLING

• 1 Large container blueberries

• 1 package cranberries

• 2 tablespoons sugar or honey

• 1 tablespoon water

• 1 tablespoon flour

BISCUIT TOPPING

• 1 cup all purpose flour, spooned into measuring cup and leveled-off with a knife

• 7 tablespoons sugar, divided

• 1¼ teaspoons baking powder

• ¼ teaspoon baking soda

• ½ teaspoon salt

• 5 tablespoons cold unsalted butter, cut into small chunks, plus more for greasing the pan

• ⅔ cup buttermilk (see note)

• ¾ teaspoon vanilla extract