Sift flour, cocoa powder, baking soda, and salt in a medium basin. Set aside.Mix melted butter, brown sugar, and sugar for 2 minutes on high speed. It will pale greatly.
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Mix in eggs and vanilla. Medium-mix until thoroughly blended.Mix in dry ingredients. Low-speed mix until mixed. Mix in small chocolate chips.
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Warm the oven up to 350℉. Set up two cookie sheets with parchment paper between them. For 10 minutes, let the dough rest so that it doesn't spread.
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Divide granulated and powdered sugar into two small bowls. Grab a 1 oz (1 Tablespoon) cookie scoop and scoop the dough. Hand-roll the dough into a ball.
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Dip the cookie dough ball in granulated sugar. Next, roll in powdered sugar. Sprinkle plenty of powdered sugar on the cookie dough ball! Use 12 cookie dough balls per sheet.
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Rest the cookie dough balls for 15 minutes. Spreading will decrease and crinkle top will improve.Bake each cookie sheet by itself. Bake 8-10 minutes.
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Underbaking makes fudgy cookies soft. They'll cook on the hot pan.Transfer the cookies to a cooling rack after 5 minutes on the heated pan.
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