Elegant White Linen Cake with Vanilla Buttercream

Ingredients

• 2 ½ cups all-purpose flour
• 2 ½ tsp baking powder
• ½ tsp salt
• 1 cup unsalted butter, softened
• 1 ½ cups granulated sugar
• 4 large eggs, at room temperature
• 1 tbsp vanilla extract
• 1 cup whole milk, at room temperature
• 1 cup unsalted butter, softened (for buttercream)
• 4 cups powdered sugar
• 2 tbsp whole milk (for buttercream)
• 1 tsp vanilla extract (for buttercream)