In a sauce pan over medium heat bring the water to a boil. Once the water in boiling, remove from the heat and add the butter. Stir until melted.
In a large bowl or stand mixer pour in the cooled butter/water mixture. Add in the sugar, eggs, almond extract and sour cream. Mix until well combined.
Add in the dry ingredients; flour, salt and baking powder
Beat, scraping down the sides until everything is well combined and batter is formed.
Pour into prepared baking sheet (13' X 18' half baking sheet size) and bake for 23-26 minutes or until a toothpick inserted in the center comes out clean.
White Sheet Cake Frosting Instructions
In a large mixing bowl add butter, milk and almond extract. Mix to combine and beat the butter.
Add in the confectioner's sugar 1/2 cup at a time until the frosting has thickened and easily forms a peak.