Carrot Cake

I don't usually get excited about carrot cake, but my mother in law makes this and it's my favorite cake, really. She makes it in a jelly roll pan (a cookie sheet with sides).

2 cups sugar
4 eggs
1 cup oil
2 cups flour
1 tsp cinnamon
2 tsp soda
3 cups grated carrots (she grinds them in the blender by filling up the blender with wather, adding the carrots, blending, then draining the carrots. If you do it this way, add 1/4 cup more flour.)
1 cup chopped walnuts
1 tsp salt
1 tsp vanilla

Bake at 350 for 35-40 min. (In a jelly roll pan)

Frosting:
1lb. powdered sugar
1 3-1/2 oz. pkg cream cheese, softened
1 stick butter
2 tsp vanilla