In a large bowl whisk together the Nutella and egg until combined. Add in the sifted flour, and knead until combined into a smooth soft dough.
Divide the dough into small pieces (about 18 g/ 0.5 oz) then roll each piece between the palms of your hands to form small even balls. Arrange the cookie balls over a baking sheet lined with parchment paper.
Make a hole in the center of each ball, using the back of a measuring spoon, a whisk or your thumb. Refrigerate the prepared cookies for 30 minutes.
Preheat oven to 350°F / 170℃.
Place the cookies in the oven and bake for 12 minutes. Remove them from the oven and allow them to cool completely.
To decorate the Nutella thumbprint cookies, transfer the Nutella in a piping bag or use a spoon to fill each cookie center with Nutella. Top with chopped hazelnuts and serve.
Notes
Please note that for all my baking recipes I like to use gram measurements as it is more accurate. However, US cups are also provided.Ingredient notes:
Nutella: make sure it is at room temperature. If it's fridge cold, place it in the microwave for a few seconds, until softened but not warmed.
Flour: for best results, weigh and then sift the flour into the baking bowl, this will make sure there are no lumps in the dough.
Baking notes:Make sure you refrigerate the unbaked cookies for the best results. I do not recommend refrigerating the dough, as it will be harder to work with.It's possible to add the Nutella filling and hazelnuts before baking the cookies. Keep an eye on the cookies while they bake, and follow the baking time precisely, this will prevent the Nutella filling from drying too much.
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The information shown is an estimate provided by an online nutrition calculator. It should not be considered a substitute for a professional nutritionist’s advice.