Place the trivet on the bottom of the Pressure Cooker and add the jars with sweetened condensed milk on top. Pour enough water to cover by at least 1 inch. Close the lid and turn the valve to "seal".
Cook on "High", on "Manual" for 60 minutes. Then, quick release the steam. Remove jars out of the water and allow to cool to room temperature.
Carefully fold in 8 to 16 oz of whipped topping (like Cool Whip), if using.
For best results, use the buttercream right away. Otherwise, refrigerate covered until ready to use. Bring back to room temperature before using.
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