For the Cake:
1/2 cup (3 1/2 ounces) granulated sugar
1/2 teaspoon salt
2 tablespoons melted butter
1 tablespoon canola oil
1 large egg
1/2 cup milk
1/4 cup sour cream
2 teaspoons vanilla extract
1 cup (5 ounces) all-purpose flour
1 1/2 teaspoons baking powder
1/8 teaspoon baking soda

For the Crumb Topping:
1 3/4 cup (8 3/4 ounces) all-purpose flour
2/3 cup (4 2/3 ounces) packed light brown sugar
1 teaspoon cinnamon
1/4 teaspoon salt
10 tablespoons (5 ounces) unsalted butter, melted
2 teaspoons vanilla extract