Sift flour, baking soda, cornstarch, and salt in a medium basin. Set aside. Zest the lemon in a small basin.Mix butter and sugar for 2 minutes on high speed. Should be pale and silky.
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Mix in lemon zest, juice, and egg. Medium-mix until blended. To blend sugar and butter, scrape the basin. Add yellow gel food coloring. I added 2 droplets.Mix in dry ingredients. Low-speed mix until mixed.
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Stir in white chocolate chips on low.Pre-heat the oven to 350℉. Use parchment on two cookie sheets. Rest cookie dough for 10 minutes. This limits spread.
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Put sugar and powdered sugar in separate bowls. Scoop dough with a 1 oz/1 tbsp cookie scoop. Use 12 cookie dough balls per sheet.Start by sugaring the cookie dough ball. Then roll in powdered sugar. Give it a thick powdered sugar covering.
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Bake all rolled pieces for 8-10 minutes. Bake until edges set. Overbaking will dry them out and dissolve the powdered sugar.Before cooling on a rack, let the cookies cool on the hot pan for 5 minutes.
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