Thick, chewy, and packed with gooey marshmallows, these Rice Krispie Treats are a classic made even better! Just a few ingredients, but a whole lot of deliciousness!
Line a 9x9-inch pan with parchment paper (or foil) with an overhang, and lightly spray with cooking spray. Set aside.
In a very large pot, melt the butter over medium-low heat, stirring occasionally. Once butter is melted, reduce heat to low. Add 8 cups (340g) of the mini marshmallows. Stir constantly until marshmallows are just melted.
Remove from heat and stir in salt, vanilla extract, and cereal. Stir until the cereal is well coated. Once mixed in, add remaining 2-1/2 cups of marshmallows. Stir until everything is well incorporated.
Pour the mixture into the prepared pan. Lightly spritz your hands with cooking spray and gently press the mixture into the pan. Avoid pressing too hard to keep the treats soft and chewy. Let cool for about 30 minutes.
Optional White Chocolate Topping: While the treats cool, add white chocolate and vegetable oil to a microwave-safe bowl. Microwave in 15-second bursts, stirring between each burst until chocolate is melted and smooth. Transfer melted chocolate to a resealable plastic bag, cut off the tip, and drizzle evenly over the bars. Immediately add sprinkles and let chocolate harden at room temperature.
Use the parchment overhang to lift the bars out of the pan. For easier cutting, run a sharp knife under hot water, dry it, and slice the bars. These treats are best enjoyed the same day.
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Notes
Note 1: The softer and fresher the marshmallows, the better these bars will taste.Storage: These treats are best enjoyed the same day, but you can store them in an airtight container at room temperature or put them in the fridge if storing longer or in warm conditions (though this will make the bars become stale quicker). To freeze, wrap each bar and freeze for 6–8 weeks, placing parchment between layers.