Prepare the Cream Filling
1-In a mixing bowl, combine heavy cream,: In a mixing bowl, combine heavy cream, mascarpone cheese, powdered sugar, and vanilla extract.
2-Whip the mixture using an electric mixer: Whip the mixture using an electric mixer on medium speed until soft peaks form, about 3-5 minutes.
3-Once whipped, cover and refrigerate while you: Once whipped, cover and refrigerate while you prepare the pastry shells.

Make the Pastry Shells
4-In a saucepan, bring water, unsalted butter,: In a saucepan, bring water, unsalted butter, and a pinch of salt to a boil over medium heat.
5-Once boiling, remove from heat and stir: Once boiling, remove from heat and stir in all-purpose flour until a dough forms.
6-Return the saucepan to low heat and: Return the saucepan to low heat and cook for an additional 2-3 minutes, stirring constantly.
7-Transfer the dough to a mixing bowl: Transfer the dough to a mixing bowl and let it cool for about 5 minutes.
8-Add eggs one at a time, mixing: Add eggs one at a time, mixing well after each addition until the dough is smooth and glossy.

Bake the Pastry Shells
9-Preheat your oven to 400°F (200°C): Preheat your oven to 400°F (200°C).
10-Line a baking sheet with parchment paper: Line a baking sheet with parchment paper.
11-Using a piping bag, pipe the dough: Using a piping bag, pipe the dough into small mounds (about the size of a golf ball) on the prepared baking sheet.
12-Bake for 20-25 minutes or until golden: Bake for 20-25 minutes or until golden brown and puffed up.
13-Remove from the oven and let cool: Remove from the oven and let cool completely on a wire rack.

Assemble the Italian Cream Bombs
14-Once the pastry shells are cool, use: Once the pastry shells are cool, use a sharp knife to cut a small slit in the side of each shell.
15-Fill a piping bag with the cream: Fill a piping bag with the cream filling and carefully pipe it into each pastry shell until filled.
16-Drizzle with chocolate ganache and sprinkle with: Drizzle with chocolate ganache and sprinkle with chopped nuts if desired.