Soft, gooey Rice Krispie treats swirled with buttery caramel and finished with a sprinkle of flaky sea salt. No-bake, crowd-pleasing bars ready in under 30 minutes.
Line a 9x13 inch baking pan with parchment paper, leaving overhang. Lightly grease the parchment with the butter for greasing.
In a large pot over low heat, melt 0.25 cup unsalted butter. Add mini marshmallows and stir constantly until fully melted and smooth. Remove from heat and stir in vanilla.
Add crispy rice cereal to the pot and gently fold until evenly coated with the marshmallow mixture.
Transfer the mixture to the prepared pan and press it into an even layer with a buttered spatula or lightly greased hands. Do not pack too firmly.
In a small saucepan over low heat (or microwave in short bursts), melt the soft caramel candies with the heavy cream, stirring frequently until smooth and pourable.
Pour the warm caramel evenly over the cereal layer and spread gently to cover.
Sprinkle the flaky sea salt evenly over the caramel while it is still warm.
Let the bars cool at room temperature until set, about 20 to 30 minutes. Lift out using the parchment and cut into 16 squares.
Store in an airtight container at room temperature for up to 3 days.
Notes
For cleaner slices, chill for 10 minutes before cutting, but serve at room temperature for the best texture. Optional: drizzle melted chocolate over the caramel before adding the salt.