Blueberry Nectarine Cobbler – Brownie Mischief

Ingredients

• 6 medium ripe nectarines, peeled and thickly sliced (about 2 1/4 lbs (1 kg))
• 2 teaspoons lemon juice
• 1/2 teaspoon pure vanilla extract
• 1/3 cup (2 3/8 oz or 67g) packed brown sugar
• 1 tablespoon corn starch
• 1/4 teaspoon ground cinnamon
• 1 1/2 cups (8 oz or 227g) blueberries
• 1 cup (4 1/2 oz or 113g) all purpose flour
• 1/2 cup (100g) granulated sugar
• 1 1/2 teaspoons baking powder
• 1/4 teaspoon fine sea salt
• 5 tablespoons (2 1/2 oz or 70g) cold butter, cubed
• 1/3 cup (2 5/8 oz or 75g) cold sour cream
• 1 tablespoon cold milk
• 1 tablespoon coarse sugar for sprinkling