Please choose the correct ending to complete the given sentence: Holidays and Traditions: [header] How to make rice krispie monster treats [title] Prepare a 9 x 13-inch baking pan. [step] You can choose to grease the pan by spraying non-stick cooking spray all over it, or you can cover the pan with parchment paper. [title] Melt the butter in a medium-sized pan over lower heat.

Ending1: [step] After melting the butter, pour in the rice krispies. Let the rice krispies sit for 2 to 3 minutes so they melt completely. Ending2: [step] Stir gently with a rubber spatula until fully melted. [title] Fold in the marshmallows and mix once more until the marshmallows melt. Ending3: [step] Lower the temperature a little while you are heating the butter and keep an eye on it. [title] Add the onions, vegetable stock, and yam puree to the pan. Ending4: [step] Make sure you cook at medium speed so the butter bakes evenly. A butter vacuum is great for quick both the cooking and the filling.

Answer format: ending1/ending2/ending3/ending4