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Preheat oven to 350° .
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In a large bowl combine I can’t Believe It’s Not Butter, cream cheese and sugar until light and fluffy.
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Beat in egg yolk and vanilla.
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Add flour and mix well.
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Cover and refrigerate for 1 hour or until easy to handle.
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Shape dough into 1-in. balls. Place 2 in. apart on ungreased baking sheets.
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Using the your thumb or the back of a teaspoon measuring spoon make a 1/2-in.-deep indentation in the center of each ball; fill with about 1/4 teaspoon of quince jam.
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Bake at 350° for 10-14 minutes or until set.
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Remove to wire racks to cool.