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Export 4 ingredients for grocery delivery
Step 1
Line a 13x9 pan with wax paper and set aside.
Step 2
Place butter in the bottom of a large saucepan over medium-low heat. Stir occasionally until butter is completely melted.
Step 3
Add 10 oz (one bag) of marshmallows and stir until just melted. Keep your heat below medium and stir frequently, this will take a bit of time for the marshmallows to melt but too-high heat can cause your rice krispie treats to come out too hard.
Step 4
Stir in vanilla extract, and then add rice krispies cereal and remaining marshmallows. Stir until ingredients are combined and additional marshmallows are just beginning to melt.
Step 5
Scatter sprinkles over the mixture and briefly stir to combine. Immediately transfer mixture to prepared 13x9 pan and use a silicone spatula or your hands to gently pat rice krispie treats down evenly into pan (don't over-handle them or this will also make them come out too hard).
Step 6
Allow Rice Krispie Treats to cool completely at room temperature before cutting and serving -- about 30-60 minutes.