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In a large bowl, mix together, butter, nutella, milk, cocoa powder, sugar, instant coffee and vanilla extract. You can use a stand mixer fitted with a paddle attachment or simply use a wooden spoon. Mix for 2 or 3 minutes or until all the ingredients are well incorporated.
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Add in the eggs one by one and make sure to mix between each egg until the mixture is smooth.
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Sift in flour along with cornstarch and baking powder. Add salt and mix to combine.
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Cover the bowl with plastic wrap and refrigerate for at least 2 hours or put in the freezer for about ½ hour or until firm.
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Form walnut size balls, using a small ice cream scoop, then shape the balls well with hands.
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Roll dough balls in granulated sugar, then in powdered sugar to coat.
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Place the dough balls in a baking sheet covered with parchment paper.
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Bake in a 350°F preheated oven for about 12 to 15 minutes. The cookies will crack on the surface and that makes them great with powdered sugar between the cracks.
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9- Let cool, then serve.