Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to make cookie butter fudge [title] Prepare the pan. [step] Get out an 8 x 8-inch (20 x 20 cm) baking pan and line it with aluminum foil. Spray the foil with cooking spray.

Ending1: Spray the sides and center with your choice of cold ingredients. [title] Mix the softened butter in the pan. Ending2: [substeps] If you want a really fluffy cookie butter topping, grease the pan first with non-stick cooking spray. [title] Measure out flour, baking powder, yeast, and vanilla extract. Ending3: Grease it with non-stick cooking spray. [substeps] To ensure that your oven is warm enough to bake your fudge, pre-heat the oven to 350 ° f (177 ° c). Ending4: This will prevent the fudge from sticking to the pan. [substeps] Ensure that the foil extends up the sides of the pan.

Answer format: ending1/ending2/ending3/ending4