Put the butter in the microwave and melt it. Put it in a big bowl and set it aside for 15 minutes to cool down.Warm the oven up to 350°F. Put parchment paper on two cookie sheets.
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Sieve flour in a medium basin. Mix in baking soda, powder, and salt.Add sugar and brown sugar to the butter bowl. Mix. Combine lemon zest, juice, egg, and yolk. A faint color.
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Mix dry and wet components. With a rubber spatula, fold. Just blend. Mix in frozen wild blueberries. Fold these carefully. Dough will be slightly colored. Be careful not to overmix.
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Scoop 6 cookie dough balls per sheet with a 3oz cookie scoop.Bake one cookie pan at a time for 14-16 minutes.
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Bake until edges are golden brown.Let the cookie cool on the pan for 10 minutes. Cool fully on a rack.
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