Texas Sheet Cake

1 C. butter
1 C. water
1/4 C. cocoa powder
2 C. flour
1 3/4 C. sugar
1 tsp. baking soda
1/4 tsp. salt
1/2 C. sour cream

-Preheat oven to 350
1.  Add butter, water and cocoa powder to small saucepan and bring to a boil.  Remove from heat.
2.  Combine dry ingredients in medium mixing bowl, add in cocoa mixture and mix well.  Stir in sour cream until smooth.  Pour into cookie sheet and bake for 20-25 minutes.  Set aside on wire rack while making frosting:

1/2 C. butter
1/4 C. milk
3 Tbsp. cocoa powder
3 1/2- 3 3/4 C. powdered sugar
2 tsp. vanilla extract

1.  Melt butter in small saucepan on medium heat.  Add milk and cocoa then bring to a boil.  Remove from heat.  Stir in powdered sugar and vanilla until smooth (may take a few minutes).  Carefully pour over warm cake.  Let cool and serve!