Grandma's Chocolate Texas Sheet Cake Recipe

Ingredients

• 1 cup salted butter
• 1 cup water
• 3 tablespoons cocoa powder
• 2 cups all-purpose flour
• 2 cups white sugar
• 0.5 teaspoon salt
• 0.5 cup buttermilk
• 2 large eggs
• 1 teaspoon baking soda
• 1 teaspoon vanilla extract
• 0.5 cup unsalted butter
• 6 tablespoons milk
• 2 cups confectioners' sugar