Easy Blueberry Cobbler with Cornmeal Cream Biscuits

Ingredients

• 6 cups fresh blueberries (rinsed and drained, 3 pints)
• 1/2 cup plus 2 tablespoons sugar (divided)
• 3 tbsp cornstarch
• 1 tbsp finely grated lemon zest
• 1 tbsp freshly squeezed lemon juice
• 1 1/2 cups all-purpose flour
• 1/3 cup cornmeal
• 2 tsp baking powder
• 1/2 tsp coarse salt
• 1/2 cup cold unsalted butter (cut into thin pats, 1 stick)
• 3/4 cup cold heavy cream (plus more for brushing)
• 2 tsp raw turbinado sugar