Instructions
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In a medium bowl, whisk together the flour, cornstarch, baking powder, and salt. Set aside.
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In a large bowl, use an electric mixer to beat the butter and 1 ¼ cups of sugar together on medium speed until light and fluffy (about 2-3 minutes). Scrape down the sides of the bowl as needed.
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Beat in the egg until fully combined. Mix in the vanilla extract and food coloring.
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With the mixer on low, gradually add the dry ingredients until just combined.
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Add ¼ cup of the strawberry jam and mix until no streaks of flour or jam remain.
2. Shape and Chill:
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Divide the dough into 12 equal portions and roll each into a ball.
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Roll each ball in the remaining 3 tablespoons of sugar to coat completely.
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Refrigerate the shaped cookies for at least 2 ½ hours. This step is crucial for preventing overspreading.
3. Bake the Cookies:
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Preheat your oven to 325°F (165°C). Line two large baking sheets with parchment paper.
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Space the chilled cookies at least 3 inches apart on the prepared sheets.
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Fill each indentation with a generous portion of the remaining ½ cup of strawberry jam.
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Bake for 14-16 minutes, or until the edges are lightly golden and the centers still look soft and pale.
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Allow the cookies to cool on the baking sheet for 10 minutes before transferring them to a wire rack to cool completely.
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While the cookies cool, make the glaze. In a small bowl, whisk the powdered sugar, 1 tablespoon of jam, and 1 tablespoon of water until completely smooth. Add a drop of food coloring if desired for a brighter pink color.
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Drizzle the glaze over the completely cooled cookies. Let the glaze set for a few minutes before serving.