In a 3-quart heavy-bottomed stainless steel saucepan, combine blueberries, ⅔ cup sugar, salt, and nutmeg. Using a potato masher, gently mash until blueberries begin to release their liquid. Stir until sugar is moistened.
In a small bowl, whisk together flour and ⅓ cup cold water. Stir flour mixture into blueberries. Bring to a simmer over medium heat, stirring until mixture begins to thicken. Stir in lemon juice. Spoon blueberry mixture into a shallow 2-quart baking dish.
Let Pie Dough stand at room temperature until slightly softened, about 10 minutes. On a lightly floured surface, roll dough into a 12×9-inch rectangle. Cut dough lengthwise into 8 strips. Arrange strips in a lattice design over filling. Trim excess dough to edge of dish. Brush dough with cream, and sprinkle with remaining 1 teaspoon sugar. Place dish on a rimmed baking sheet.
Bake until crust is golden brown and filling is bubbly, about 43 minutes. Let cool completely on a wire rack. Serve with ice cream.
Recipe by Louisiana Cookin' at https://louisianacookin.com/blueberry-cobbler/