- 1 package (8 ounces) cream cheese, softened
- 1/2 cup butter, softened
- 1 teaspoon vanilla extract
- 4 cups confectioners' sugar
- 2/3 cup chopped walnuts
Preheat oven to 350 degrees F (175 degrees C). Grease a 9x13x2-inch baking dish.
Whisk flour, sugar, baking soda, ground cinnamon, salt, and nutmeg together in a bowl. Beat carrots, mandarin oranges, oil, eggs, vanilla extract, and orange zest into flour mixture with an electric mixer until batter is smooth, about 2 minutes. Pour batter into prepared baking dish.
Bake in the preheated oven until a toothpick inserted into the center of the cake comes out clean, 40 to 50 minutes.
For frosting, beat cream cheese, butter and vanilla in a bowl until smooth; beat in sugar. Spread over cake. Sprinkle with nuts. Decorate as desired.