Chunky Apple Cake with Cream Cheese Frosting

Ingredients:

1/2 cup (1 stick) butter
1 cup white sugar
1 cup brown sugar
2 large eggs
1 tsp. pure vanilla extract
2 cups all-purpose flour (I bet whole wheat would work well)
1 tsp. baking soda
1 tsp. salt
2 tsp. ground cinnamon
4 Granny Smith apples, peeled and sliced
1 cup walnuts, toasted and chopped (optional)
Cream Cheese Frosting:
1/4 cup butter, room temperature
8 oz. cream cheese, room temperature
pinch salt
1 tsp. pure vanilla extract
2 cups powdered sugar