Based on the context and the answer, generate a question. 

Context: I added chopped walnuts . I got 16 muffins . Oatmeal Muffins ( Adapted from " 500 Cupcakes " by Fergal Connolly)Makes 12 - 16 muffins2 cups all - purpose flour1 cup packed light brown sugar1 tbsp . baking powder1 tsp .

Answer:

They stirred the batter .



What did the writer do after adding the chopped nuts ?