Grease a 8x8” or 9x9” pan with butter. Line the pan with parchment paper and lightly butter the parchment, or spray with oil. You can also use a 9" oven-proof skillet. If using the baking skillet, such as a cast iron or porcelain skillet, you can simply spray it with oil, or grease it with butter.
Melt the butter and 1 cup of semi-sweet chocolate in a large bowl. I like to use a large glass bowl that I stick in the microwave for 30 second intervals and stir until everything is melted together.
Add the sugars to melted butter and chocolate and whisk until incorporated.
Add the eggs one at a time and whisk until incorporated before adding the next egg.
Add the vanilla extract and whisk.
Sift the flour, cocoa powder and salt together. Add to the batter and whisk until incorporated.
Add the chocolate chips and stir with a spatula until combined.
Add half of the batter to the prepared pan or skillet. Spread 1 cup of Nutella over batter. You can scatter spoonfuls of Nutella over the batter, and then use a spatula to gently spread the Nutella around.
Then pour the rest of the batter over the Nutella.
Bake in the pre-heated oven for 25 to 30 minutes, until the brownie looks set on top, in the middle, and around the edges.
Let it cool, cut into pieces and serve.
Notes
Nuts: You can add nuts to this recipe as well. I've added cashews in the past, and the salty cashews go so well with the sweet Nutella and rich chocolate. Add up to 1/2 cup of chopped nuts.Skillet: Make the recipe just the same and add it to a skillet instead of a baking pan. I've made it on my cast iron skillet, and served with ice cream right out of the pan before the brownie had cooled down all the way.Chocolate: Feel free to use whatever chocolate you prefer, semi-sweet, milk, or dark.Chocolate Chips: You can also add white chocolate chips, or peanut butter chips if desired.