Which of the following is the correct first step in making a vanilla bean Coolatta?

The correct first step in making a vanilla bean Coolatta is to measure the base. This is essential because the base provides the foundation of flavor and texture for the drink. In the case of a vanilla bean Coolatta, it typically involves using a specific mix of ingredients meant to achieve the desired creamy consistency and true vanilla flavor that customers expect.

Measuring the base accurately ensures that the final product will meet quality standards and customer expectations. If you were to add whole milk first, the drink's texture and flavor profile might not be properly established, as the base is integral to the drink's overall composition.