Blueberry Crumb Cake

Name: Blueberry Crumb Cake
Ingredients: For the crumb topping; 2 1/2 cups all-purpose flour; 1 cup firmly packed light brown sugar; 2 teaspoons ground cinnamon; 1/2 teaspoon coarse salt; 1 cup (2 sticks) unsalted butter; For the cake; 1 1/2 cups plus 1 tablespoon all-purpose flour; 2 1/2 teaspoons baking powder; 1 teaspoon coarse salt; 1/2 cup whole milk; 1/2 cup granulated sugar; 2 tablespoons vegetable oil; 1 large egg, at room temperature; 1 tablespoon pure vanilla extract; 1 pint (2 cups) fresh blueberries; 1 to 2 tablespoons confectioners' sugar