Adapted from butterbaking.wordpress.com
cup plain flour
Jar of Nutella, refrigerated, for stuffing
Preheat the oven to 350 degrees and line 2 trays with baking paper. In a large bowl, mix together the Nutella and the egg. Add the flour and stir until incorporated. The mixture will be quite thick. Roll a small teaspoon of dough into a ball and flatten in your palm. Place on the lined baking tray. Put a teaspoon of cold Nutella in the center of the cookie. Roll a second small teaspoon of dough into a ball and flatten in your palm. Place it over the Nutella and press the edges of the two cookies together, sealing them like ravioli. Repeat the process until all the cookie dough has been used. Bake for 6 – 8 minutes, I always err on the side of under baking for a chewier cookie.