White Texas Sheet Cake

Ingredients

• 2 cups all-purpose flour
• 2 cups granulated sugar
• 1 tsp baking soda
• 1/2 tsp salt
• 1 cup water
• 1 cup unsalted butter
• 1/2 cup sour cream or plain yogurt
• 2 large eggs
• 1 tsp vanilla extract
• 1/2 cup unsalted butter (for frosting)
• 1/4 cup milk
• 4 cups powdered sugar
• 1 tsp vanilla extract (for frosting)
• Optional: Sprinkles or white chocolate curls for topping