You will be given a definition of a task first, then some input of the task.
In this task, you will be presented with the directions of a recipe separated by "," and have to fill in the "___" which is a step that is missing from the recipe.

Preheat oven to 350.,Grease and flour 8 x 8 x 2-inch pan. Set aside.,In medium mixing bowl, blend butter, sugar, eggs, chocolate syrup, sour cream and vanilla.,______,Beat at low speed of electric mixer until blended, scraping bowl constantly.,Beat at medium speed for 1 minute, scraping bowl occasionally.
Output:
Add flour, chocolate chips, baking powder and salt.