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Export 6 ingredients for grocery delivery
Heat oven to 350 degrees. Butter and line an 8x8-inch baking dish with parchment paper.
Combine the chopped chocolate and butter in a heat-safe bowl set over a pan of simmering water. Stir the mixture occasionally until melted. Set aside.
In the bowl of a stand mixer fitted with the paddle attachment, combine 3/4 cup/222 grams chocolate-hazelnut spread, sugar and eggs. Mix on medium-high for 5 minutes, scraping down the bowl a couple of times. Add espresso powder and vanilla and mix briefly to combine.
Turn the mixer to low and stream in the chocolate-butter mixture. Mix until well combined, then fold in the flour and salt.
Pour the mixture into the prepared pan, spread evenly with a knife or offset spatula and spoon several dollops of the remaining 1/4 cup/74 grams chocolate-hazelnut spread evenly over the top. Use a toothpick or skewer to swirl the spread and brownie batter a few times, leaving big streaks of the spread on the surface.
Bake the brownies for 25 to 30 minutes, or until just set in the middle. A toothpick inserted into the center should pull out some moist crumbs.