Luscious egg free cake My Fudgy Chocolate Secret

Ingredients

• 1 ¾ cups (210g) all-purpose flour, spooned & leveled
• ¾ cup (75g) unsweetened cocoa powder
• 1 ½ teaspoons baking powder
• 1 ½ teaspoons baking soda
• ¾ teaspoon salt
• 1 ¾ cups (350g) granulated sugar
• 1 cup (240ml) buttermilk
• ½ cup (120ml) vegetable oil
• 2 teaspoons vanilla extract
• 1 cup (240ml) boiling water
• 2 teaspoons white vinegar
• 1 cup (2 sticks/226g) unsalted butter, softened
• 3 cups (360g) powdered sugar
• ½ teaspoon salt
• ½ cup (120ml) milk (dairy or non-dairy)
• 1 teaspoon vanilla extract