Line a 8X8 pan with foil and spray foil with cooking spray. Set aside.
Place sweetened condensed milk and chocolate chips in a saucepan. Heat over medium low until chocolate is melted and mixture is smooth. Pour into prepared pan and let set for at least 2 hours or overnight. Can store cooled fudge, covered, in fridge until ready to use.
Flourless Nutella Cookies:
Preheat oven to 350ºF. Line a baking sheet with parchment paper and set aside.
Take half of the prepared fudge (You will have fudge leftover. See Recipe Notes for leftover ideas.) and cut into 24 1" squares. Shape each square into a ball-ish shape (doesn't have to be perfect - Nutella dough will be going around it). Take Nutella dough ball and press around fudge ball until it is completely covered. Place balls about 2 inches apart on prepared baking sheet.
Bake for 12-15 minutes or until just set. Cool on baking sheet for 5 minutes and then transfer to wire rack to cool completely.
Optional Chocolate Drizzle:
In a small microwave safe bowl, place chocolate chips and vegetable oil. Heat in microwave on high for 1 minute, stirring occasionally. Use a spoon to drizzle over cookies and dust with sprinkles or fleur de sel. Let chocolate cool and harden before storing in airtight container.
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What to do With Leftover Fudge?
The fudge filling for these Flourless Nutella Oatmeal Cookies makes more than you need for this recipe. Good fudge should never go to waste so here are some more uses for leftover fudge.
Leftover fudge may be frozen. Wrap it securely with plastic wrap, place it in a plastic freezer bag, and "press" any remaining air out.
Chop up fudge in small pieces and fold into brownie batter or cookie dough.
Use chopped fudge on cheesecake, ice cream, or milkshakes.
More Cookie Possibilities!
Three ingredient nutella cookie dough is an amazing recipe that can transform into so many different versions. Create your own unique cookie recipe or try some of these suggestions.
Chocolate Orange Cookies: Add 1/2 teaspoon orange zest and 1/2 teaspoon orange extract into the cookie dough. After baking drizzle with melted chocolate. You can even make homemade candied orange peel to sprinkle on top!
Nutella Peanut Butter Cookies: Leave out the fudge filling and roll cookie dough into 1 inch balls and bake as directed. Immediately press a miniature Peanut Butter Cup onto the top after baking.
Salted Nutella Cookies: Drizzle the tops of the cookies with melted chocolate and sprinkle fleur de sel on top for a salted Nutella cookie.
Nutella CaramelCookies: Leave out the fudge filling and roll cookie dough into 1 inch balls and bake as directed. Immediately press a miniature Rolo candy onto the top after baking.
Chunky Nutella Cookies: Enhance the nutty flavor from the Nutella and mix chopped hazelnuts or macadamia nuts into the cookie dough.