Which method is NOT typically used for flavoring buttercream?

Using dried fruits as a method for flavoring buttercream is not typically practiced primarily because dried fruits have a low moisture content, which can lead to unintended texture changes in the frosting. Buttercream is generally a smooth and creamy texture, and incorporating dried fruits directly can create a grainy or uneven consistency.

In contrast, adding extracts, incorporating fruit purees, and mixing in spices are common techniques used to enhance the flavor of buttercream. Extracts provide concentrated flavors without altering the texture significantly. Fruit purees can introduce moisture and flavor without compromising the creaminess, while spices can add depth and warmth to the taste without adversely affecting the cream structure.