Simple Christmas Sheet Cake - Remove pot from heat and briskly stir in flour, sugar, and sour cream. Add water and bring to a boil. Pour batter into prepared sheet pan and smooth top. Web in a large pot, melt butter. Stir in eggs, vanilla, baking soda, and salt until all ingredients are well blended.
Remove pot from heat and briskly stir in flour, sugar, and sour cream. Stir in eggs, vanilla, baking soda, and salt until all ingredients are well blended. Pour batter into prepared sheet pan and smooth top. Add water and bring to a boil. Web in a large pot, melt butter.