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Cream together butter and cream cheese until well combined.
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Add sugars and beat on medium-high speed for 2 minutes, until light and fluffy. Pause and scrape down bowl as needed.
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Add egg and beat until combined.
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Stir in vanilla extract.
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In a separate bowl, whisk together flour, cornstarch, baking soda and salt.
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With the mixer on low speed, gradually add the flour mixture to the butter mixture until combined.
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Stir in white chocolate chips on low speed. Add the sprinkles and stir until just combined.
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Cover and transfer to a refrigerator to chill for 30 minutes.
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Preheat oven to 350 F and line cookie sheets with parchment paper.
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Scoop dough into 1 ½ inch dough balls. Place on parchment lined cookie sheets and slightly flatten with the bottom of a clean glass. Add additional sprinkle if desired.
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Bake for 8 to 10 minutes, remove from oven and allow to cool for 10 minutes before transferring to a cooling rack to cool completely.