Made by creaming butter and sugar with milk, American buttercream is the simplest buttercream to make, as well as the sweetest, due to the high sugar to fat ratio. It has a thicker texture than Swiss meringue buttercream but is still soft and easy to spread and pipe, so ideal for decorative work. It’s also a great blank canvas which can be flavoured or coloured with pretty much anything- melted chocolate, cocoa, jam, curd, extracts like almond or peppermint, or spices.
As with when you’re making Swiss meringue buttercream it’s really important that the butter is at room temperature when you start, to ensure your end result is creamy and lump-free. Get it out of the fridge in advance and cut into cubes to help it to soften up.
Here’s how to make American buttercream using your 
Titanium Chef Patissier XL. This recipe makes 1.95kg, which is enough to ice a cake serving 6-8 people:
Ingredients
650g unsalted butter, cubed and at room temperature
1300g icing sugar
1/4 tsp salt
2 tsp vanilla extract
1 tbsp milk
Method
Lift the Chef Patissier XL head and fit the heat shield and creaming beater. Attach either the EasyWarm or Mixer bowl.
Add the butter to the bowl and fit the splash guard. Start the machine on speed Min, and gradually increase speed. Mix on speed 1 for 30 seconds.
Add half of the icing sugar to the bowl, along with the salt, vanilla extract and milk.
Start the machine on speed Min and gradually increase speed. Mix on speed 1 for 30 seconds, then increase to speed 3 for 2-3 minutes, until the mixture is smooth and fluffy.
Scrape down the sides of the bowl with a spatula before adding the remaining icing sugar to the bowl. Start the machine on speed Min and gradually increase speed. Mix on speed 1 for 30 seconds, then increase to speed 3 for 2-3 minutes, until the sugar is all combined and the mixture is smooth. You can add more milk if the mixture needs loosening.
How to use
Unused buttercream can be stored in the fridge in an airtight container for up to a week. Bring back to room temperature before using- you may need to beat again to loosen it up.