Preheat the oven to 350°F or 175°C.
Beat the softened butter, sugar, and brown sugar together until creamy in a large mixing bowl using the paddle attachment.
Add the peanut butter, egg and vanilla and beat until fully incorporated.
Add the flour and baking soda, again beating until fully incorporated.
Place the dough in the refrigerator for ½ to 1 hour until cool.
Use your hands to form walnut-sized balls of dough.
Place the balls on a cookie sheet lined with [amazon_textlink asin='B01CYXU7DU' text='baking paper' template='ProductLink' store='flavorofita02-20' marketplace='US' link_id='c42253ad-e4a5-11e7-bbc5-cf30fad25bf8'].
If you wish, you can roll the dough balls in sprinkles until well coated.
Make sure that you leave an inch or more in between each dough ball.
Bake the cookies for 10 minutes.
Allow the cookies to cool for 5 to 7 minutes before placing a Gianduia chocolate on each cookie.
Gently press the chocolate into the cookie so that it's well inserted.
Place the cookie sheet in the refrigerator so the cookies will cool rapidly, otherwise the chocolates will begin to melt.