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Preheat the oven to 375 degrees F and line baking sheets with parchment paper.
Whip the softened butter and brown sugar together until pale and fluffy (at least 5 minutes on high speed).
Mix in the whole egg, additional egg yolk, and vanilla extract until combined.
Stir in the flour, cornstarch, baking powder, and salt until just barely combined.
Use a 1.5-tablespoon scoop to portion balls of dough onto the prepared baking sheets.
Sprinkle the tops of the unbaked cookies with raw sugar, if desired.
Bake until the cookies are set around the edges but still very doughy towards their centers (approximately 5 to 9 minutes).
Allow to cool completely on the baking sheet.