Preheat the oven to 325°F. Prep a bundt pan with nonstick spray.
In a large bowl, whisk the vegetable oil, brown sugar, granulated sugar, eggs, sour cream, and vanilla.
1¼ cups vegetable oil, 1 cup brown sugar, 1 cup granulated sugar, 3 large eggs, ½ cup sour cream, 2 teaspoons pure vanilla extract
In a separate medium bowl, whisk the flour, baking soda, salt, and cinnamon. Pour the dry ingredients into the wet and stir until mostly combined with a few streaks of flour.
3 cups all-purpose flour, 1½ teaspoons baking soda, ½ teaspoon kosher salt, 1 teaspoon ground cinnamon
Fold in the apples until they are evenly distributed.
3 cups chopped apples
Pour into the prepared bundt pan and bake for 55-70 minutes, or until a toothpick inserted into the center of the cake comes out clean.
Let the cake cool in the pan on a wire rack for 1 hour. Invert the cake onto your serving platter.
In a small bowl, stir together the turbinado sugar and cinnamon.
¼ cup turbinado sugar, 2 teaspoons ground cinnamon
Brush the cake with the melted butter and sprinkle over the cinnamon sugar. Serve and enjoy.
¼ cup unsalted butter