Blueberry Orange Crumb Cake

Name: Blueberry Orange Crumb Cake
Ingredients: 1½ cups blueberries; ⅔ cup buttermilk; ½ teaspoon vanilla extract; 1 tablespoon finely grated orange zest; 1 large egg; 1 cup granulated sugar; ½ cup unsalted butter, room temperature; ¼ teaspoon salt; 2 teaspoons baking powder; 1 cup all-purpose flour; ½ cup brown sugar, packed; ⅛ teaspoon salt; ½ teaspoon ground cinnamon; ½ cup cold unsalted butter, cut into cubes; 1¾ cups all-purpose flour