Blackberry Coffee Cake

Ingredients

• 1/2 cup flour (60g)
• 1/4 cup brown sugar, packed (53g)
• 2 tablespoons granulated sugar (25g)
• 1/2 teaspoon cinnamon
• Pinch of salt
• 4 tablespoons butter, melted (56g)
• 1 1/2 cup all purpose flour (180g)
• 1 1/2 teaspoons baking powder
• 1/4 teaspoon baking soda
• 1/4 teaspoon salt
• 1/2 cup unsalted butter, room temperature (113g)
• 2/3 cup granulated sugar (133g)
• 2 large eggs, room temperature
• 1 teaspoon vanilla extract
• 1/2 cup sour cream (120g)
• 2 tablespoons milk (30g)
• 1 1/2 cups fresh blackberries (6 ounces, 170g)