Classic Vanilla Birthday Cake with Buttercream Frosting - My Home Made Recipe

Ingredients

• Baking spray or softened butter and flour, for the pans
• 2 1/2 cups (285 g) cake flour, spooned and leveled
• 2 teaspoons baking powder
• 1/2 teaspoon baking soda
• 1/2 teaspoon fine salt
• 3/4 cup (170 g) unsalted butter, softened
• 1/4 cup (60 ml) neutral oil
• 1 3/4 cups (350 g) granulated sugar
• 3 large eggs, room temperature
• 2 large egg yolks, room temperature
• 1 tablespoon vanilla extract
• 1 cup (240 ml) buttermilk, room temperature
• 1 1/2 cups (340 g) unsalted butter, softened
• 5 cups (600 g) powdered sugar, sifted if lumpy
• 2 teaspoons vanilla extract
• 1/4 teaspoon fine salt
• 2-4 tablespoons heavy cream or whole milk
• 1/2 cup rainbow sprinkles, for decorating