Foryoueats: Vanilla Sheet Cake with Whipped Buttercream Frosting

Ingredients

• 3 cups (354g) cake flour(spooned & leveled)
• 1 and 1/2 cups (300g) granulated sugar
• 1 teaspoon baking powder
• 1/2 teaspoon baking soda
• 1/2 teaspoon salt
• 1 cup (16 Tbsp; 226g) unsalted butter, cubed and softened to room temperature
• 1 Tablespoon pure vanilla extract
• 1 cup (240ml) whole milk, at room temperature and divided
• 1/3 cup(80g)sour cream, at room temperature
• 3 large eggs, at room temperature
• Whipped Vanilla Buttercream:
• 1 cup (16 Tbsp; 226g) unsalted butter, softened to room temperature
• 4 and 1/2 cups (540g) confectioners’ sugar
• 1/3 cup (80ml)heavy cream
• 2 teaspoonspure vanilla extract
• salt, to taste
• optional: sprinkles for garnish