In a mixing bowl, combine heavy cream, mascarpone cheese, powdered sugar, and vanilla extract. Whip the mixture on medium speed until soft peaks form, about 3 to 5 minutes. Cover and refrigerate.

In a medium saucepan, bring 1 cup of water, ½ cup of unsalted butter, and a pinch of salt to a rolling boil. Reduce heat and stir in 1 cup of all-purpose flour, cooking for 2-3 minutes until the dough pulls away from the pan. Remove from heat and mix in eggs one at a time until smooth.

Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper. Pipe mounds of dough onto the sheet, bake for 20-25 minutes until golden brown, then cool on a wire rack.

Cut slits in the tops of cooled pastry shells and fill with chilled cream using a piping bag. Drizzle with chocolate ganache and sprinkle with nuts or berries.

Arrange the filled Italian Cream Bombs on a platter and serve immediately for the best experience.