Combine the ingredients

• Place the softened butter, powdered sugar, heavy cream, vanilla extract and salt in a deep mixing bowl.

Blend with the immersion blender

• Submerge the immersion blender and blend the mixture until it becomes completely smooth and well behaved.
• Scrape down the sides of the bowl with a spatula and blend again to catch any dry pockets.

Finish and use

• Give the buttercream a final stir with the spatula until glossy and smooth, then use it to decorate your cake.