New York Crumb Cake

INGREDIENTS

• 2 tablespoons canola oil, plus more for pan
• 4 cups all-purpose flour, plus more for pan
• 1/2 cup granulated sugar
• 2 1/2 teaspoons baking powder
• 1/2 teaspoon salt
• 1 large egg
• 1/2 cup milk
• 2 teaspoons pure vanilla extract
• 1 cup packed light-brown sugar
• 1 1/2 teaspoons ground cinnamon
• 1 cup (2 sticks) unsalted butter, melted and cooled
• Confectioners' sugar, for dusting