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Combine sugars and egg in a bowl; beat for 3 minutes.
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Add softened butter and beat again until combined.
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Next, add ube jam and ube extract; mix well.
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Scrape down the sides and bottom of the bowl.
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Add flour, baking powder, and salt. Beat again just until combined, then scrape the sides and bottom of the bowl. Be careful not to overmix.
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Cover the bowl tightly with cling wrap and keep inside the fridge for at least 4 hours up to overnight.
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When ready to bake, preheat the oven to 350 F. Prepare baking pan lined with parchment paper.
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Scoop about 1 tbsp of cookie dough and form into balls. Coat with powdered sugar. Place them on the prepared baking sheet, leaving about 2 inches apart.
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Bake for 9-12 minutes or until bottom is slightly browned, rotating the pan halfway through baking.
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Remove from the oven and leave in the baking pan for about 2 minutes and then transfer to cooling rack.