Which ingredient is typically not found in a milkshake?

The typical ingredients of a milkshake include ice cream, milk, and sometimes malted milk powder, which adds a rich, malty flavor to the drink. These ingredients are essential as they contribute to the creamy texture and sweetness that define a classic milkshake.

Nuts, on the other hand, are not a standard ingredient in traditional milkshakes. While some variations might include nuts as a topping or mixed in for added texture and flavor, it is not a foundational component of a typical milkshake. Therefore, the absence of nuts in a classic milkshake formulation makes this option the correct choice for the question.