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Cream the butter, sugar, and salt with an electric mixer until light and fluffy, AT LEAST two minutes.
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Add the egg yolks, cream, and vanilla. Mix another two minutes.
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Add the flour and mix until incorporated.
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Divide the dough into three discs, flatten each, wrap in plastic wrap, and refrigerate until firm.
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Roll one disc at a time between two sheets of waxed paper to 1/4 inch thickness, freeze in the paper for 15-30 minutes.
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Preheat the oven to 325°F.
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Remove one sheet of dough from the freezer, and cut shapes. Reroll the scraps in waxed paper (PLEASE do not add more flour!) and refreeze.
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Bake cookies on a parchment-lined cookie sheet for 8-12 minutes until they begin to barely brown around the edges. They will firm up as they cool, I promise!
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Remove to racks to cool, then decorate!