Carrot Cake Cheesecake

Preheat oven to 350° and grease a 9" springform pan. Make carrot cake mixture: In a large bowl, combine flour, sugar, cinnamon, salt and baking soda. Stir in oil, then add eggs and mix until combined. Add carrots, raisins and nuts and mix until combined. Make cheesecake mixture: In a large bowl using a hand mixer or in the bowl of a stand mixer using the whisk attachment, beat cream cheese and sugar until smooth. Stir in salt and flour. Mix in vanilla and eggs, beating 1 minute between each addition, then add sour cream. Assemble cheesecake: Pour 2/3 carrot cake mixture into prepared pan and smooth top with spatula. Top with spoonfuls of 1/3 cheesecake mixture, then pour over remaining carrot cake mixture. Top with remaining cheesecake mixture and smooth top with a spatula. Bake until center is only slightly jiggly, 1 hour. Let cool completely, 1 hour, then transfer to the fridge to cool, 4 hours, or up to overnight. Run a knife around inside of springform pan and unmold from pan. When ready to serve, make frosting: Beat sugar, butter, cream cheese and vanilla until smooth. Frost cheesecake, then garnish with pecans or walnuts and let chill, 10 minutes, before serving.