Flaky Pistachio Cream Croissant — French Pastry

Ingredients

• 4 large all-butter croissants (day-old preferred)
• 100 g unsalted shelled pistachios
• 60 g granulated sugar
• 80 g unsalted butter, softened
• 1 large egg
• 1 tbsp heavy cream
• 1/2 tsp pure vanilla extract
• Pinch of salt
• 2 tbsp chopped pistachios
• 2 tbsp powdered sugar (for dusting)