Green Velvet Cheesecake Cake

Name: Green Velvet Cheesecake Cake
Prep time: 1 h
Cook time: 1 h 15 min
Total time: 2 h 15 min
Cuisine: American
Ingredients: Two 8-ounce packages cream cheese, (at room temperature); 2/3 cup granulated white sugar; pinch of salt; 2 large eggs; 1/3 cup sour cream; 1/3 cup heavy whipping cream; 1 teaspoon vanilla extract; a few drops of green food coloring or gel paste, (if desired); 2 ½ cups all purpose flour; 2 tablespoons unsweetened cocoa powder; 1/2 teaspoon salt; 1 ½ cups canola or vegetable oil; 1 ½ cups granulated white sugar; 1 teaspoon white vinegar; 1 teaspoon baking soda; 1 cup buttermilk; 2 tablespoons (1 ounce bottle) green food coloring ((alternately, you can use gel paste)); 1/2 cup (1 stick) unsalted butter, (at room temperature); One 7-ounce jar marshmallow creme; 1 cup powdered sugar; a few drops of green food coloring, (if desired)