Preheat the oven to 350 degrees.
Combine the flour, cocoa powder, baking powder and salt. Set aside.
In a separate bowl, combine the eggs, sugar, melted butter and vanilla.
Next, slowly fold in the dry ingredients and stir until smooth.
Take two cookies and spread 1 tbs of Nutella on top of each then stack them.
Place the 2 cookies into a liner or silicone baking cup.
Repeat with the rest of the cookies.
Once all of your cookies are in place, spoon a few tablespoons of brownie batter directly on top. It will run over the edges filling the liner.
**I was concerned at first that it would cover the cookies completely, but it didn't!
I used a 1/8 measuring cup for this and it seemed to be the perfect amount for each cookie stack.
Bake 20-25 minutes.
Insert a toothpick in the side at around 20 minutes and if it comes out clean they are done.
*Makes 12 servings. 1 Nutella Brownie Bite = 1 serving.