Preheat oven to 350℉
Prepare 2 baking sheet pans by lining with parchment paper or silicone baking mats.
In a medium-sized bowl, combine flour, baking soda and salt. Sift if necessary to remove any lumps.
Using a stand-mixer with the paddle attachment, begin mixing butter, brown sugar and granulated sugar until light and fluffy (approximately 2 - 3 minutes on medium speed). Scrape down the bowl with a rubber spatula as needed.
Add eggs to mixing bowl. Mix on low speed until well combined, scraping down the bowl as needed.
Add flour mixture and mix on low speed until combined, scraping down the bowl as needed.
Remove bowl from mixer. Add hazelnut praline pieces and stir in by hand until evenly distributed.
Create 24 small discs of cookie dough (approximately 1" round and ⅛" thick). These are used to seal the Nutella in the cookies.
Create balls of cookie dough using approximately 1 ½ tablespoons per cookie. Place on prepared baking pans leaving 2" of space between each cookie.
Using your palm, flatten each cookie slightly. Place a frozen Nutella disc in the middle of each cookie.
Place discs of cookie dough made early on top of Nutella discs. Pinch dough over disc and roll into a ball. Place back on cookie sheet.
Bake for 12 - 15 minutes or until tops and edges are a pale golden color.
Cool cookies on the baking sheets for 10 minutes, then transfer to a wire rack to cool completely.