Instructions: 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.
Input: ______,Mix butter and sugar; add eggs one at a time while mixing.,Sift baking powder, flour and salt together, then add slowly while mixing.,Add vanilla.,Preheat oven and start at 300°.,Bake for 45 minutes, then decrease oven heat to 250° and bake for 1 1/2 to 2 hours.
Output:
Let butter soften.