Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to make chocolate chip ice cream sandwiches [title] Preheat the oven to 350 degrees and lightly butter several large baking sheets. [step] In a large bowl , [title] Stir together the flour, baking powder, and salt in a large bowl. [step] In a separate bowl, stir the butter, sugars, oil, and corn syrup until combined.

Ending1: [title] Place a thick layer of the ice cream on one of the baking sheets. [step] Line the bottom of each sheet with parchment paper. Ending2: Add the egg and vanilla extract until blended, and then the flour mixture. Stir in the chocolate chips and nuts, if desired. Ending3: [substeps] You do not need to worry about stirring or whisking while you're creaming the ingredients. [title] Whip 1 cup of butter and 1/4 cup of sugar in a stand mixer. Ending4: [title] Grease and flour several 10 x 8 inch (22 x 30 cm) baking sheets. [step] The baking sheets should be lightly greased to prevent sticking.

Answer format: ending1/ending2/ending3/ending4