Nonstick cooking spray, for the pan

1/3 cup light brown sugar

2 teaspoons ground cinnamon

2 apples (any kind), peeled and chopped

2/3 cup plus 2 tablespoons granulated sugar

1/2 cup (1 stick) butter, softened

2 large eggs

1 1/2 teaspoons vanilla extract

1 1/2 cups all-purpose flour

1 3/4 teaspoons baking powder

1/2 cup plus 1 to 3 tablespoons milk or almond milk

1/2 cup powdered sugar