Bring butter and water to a boil in a medium sized saucepan. While mixture is boiling, whisk together the flour, sugar, and salt in a large mixing bowl. Pour hot mixture over dry ingredients and beat well. Whisk together baking soda, sour cream, eggs, and flavorings in a small bowl. Add to mixing bowl and beat till smooth.
Pour into a well greased 10"x15" sheet pan with sides. Bake at 375° for about 20 minutes or until a toothpick comes out clean.