Step 1: Preheat your oven to 350°F (175°C).
Step 2: Cut the croissants into bite-sized pieces.
Step 3: In a mixing bowl, whisk together the eggs, heavy cream, Nutella, sugar, vanilla extract, and salt until smooth.
Step 4: In your baking dish, layer croissant pieces and sprinkle pecans on top. Pour the custard mixture over the croissants and let it sit for 10-15 minutes.
Step 5: Bake for 30-35 minutes or until golden brown and set.
Step 6: Let it cool, dust with powdered sugar, and serve warm or at room temperature.