Ingredients with Measurements:
- 1 cup unsalted butter
- 2 cups granulated sugar
- 1 cup unsweetened cocoa powder
- 1 teaspoon salt
- 1 teaspoon baking powder
- 1 tablespoon vanilla extract
- 4 large eggs
- 1 1/2 cups all-purpose flour
- 1 cup chopped hazelnuts
- 1 cup chopped dark chocolate
- 1/2 cup Nutella

Special equipment needed:
- 9x13 inch baking pan
- Mixing bowls
- Electric mixer
- Spatula
- Parchment paper

Step-by-step instructions:

1. Preheat the oven to 350°F. Line a 9x13 inch baking pan with parchment paper.

2. In a large mixing bowl, melt the butter in the microwave or on the stove. Add the sugar, cocoa powder, salt, baking powder, and vanilla extract. Mix until well combined.

3. Add the eggs one at a time, mixing well after each addition.

4. Gradually add the flour, mixing until just combined.

5. Fold in the chopped hazelnuts and dark chocolate.

6. Pour the batter into the prepared pan and smooth the top with a spatula.

7. Drop spoonfuls of Nutella on top of the batter and swirl with a knife.

8. Bake for 25-30 minutes or until a toothpick inserted in the center comes out clean.

9. Let the brownies cool in the pan for 10 minutes before removing them from the pan and cutting into squares.


Time:
Preparation time: 20 minutes
Cooking time: 25-30 minutes
Temperature:
350°F
Serving size:
12-16 brownies

Nutritional information:
Calories: 450
Fat: 28g
Saturated Fat: 13g
Cholesterol: 95mg
Sodium: 220mg
Carbohydrates: 47g
Fiber: 4g
Sugar: 34g
Protein: 6g

Substitutions for ingredients:
- You can use salted butter instead of unsalted butter, but reduce the amount of salt in the recipe.
- You can use milk chocolate or white chocolate instead of dark chocolate.
- You can use any type of nuts instead of hazelnuts.

Variations:
- Add a teaspoon of espresso powder to the batter for a coffee flavor.
- Add a teaspoon of cinnamon to the batter for a spicy kick.
- Use peanut butter instead of Nutella for a different flavor.

Tips and tricks:
- Make sure to line the baking pan with parchment paper to make it easier to remove the brownies from the pan.
- Don't overmix the batter or the brownies will be tough.
- Let the brownies cool completely before cutting them into squares.

Storage instructions:
Store the brownies in an airtight container at room temperature for up to 3 days.

Reheating instructions:
Microwave the brownies for 10-15 seconds to warm them up before serving.

Presentation ideas:
Serve the brownies on a platter with a dusting of powdered sugar.

Garnishes:
Sprinkle chopped hazelnuts on top of the brownies before serving.

Pairings:
Serve the brownies with a glass of milk or a cup of coffee.

Suggested side dishes:
Serve the brownies with a scoop of vanilla ice cream.

Troubleshooting advice:
- If the brownies are too dry, add a tablespoon of milk to the batter.
- If the brownies are too wet, add a tablespoon of flour to the batter.

Food safety advice:
Make sure to wash your hands and all utensils before and after handling food.

Food history:
Bacio is an Italian chocolate and hazelnut candy. This recipe is inspired by the flavors of Bacio.

Flavor profiles:
Rich, chocolatey, nutty, and sweet.

Serving suggestions:
Serve the brownies as a dessert or a snack.

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Taste: Rich, Chocolatey, Sweet, Decadent, Creamy