Chocolate Almond Croissants

Name: Chocolate Almond Croissants
Ingredients: 100 g granulated sugar; 100 g water; 115 g unsalted butter (softened to room temperature); 100 g almond flour; 60 g powdered sugar; 2 tablespoons cocoa powder; 1/8 teaspoon salt; 2 large eggs (room temperature); 1/2 teaspoon almond extract* or vanilla extract (optional); 4 croissants (day-old or left out to dry overnight); 100 g dark chocolate (broken into pieces (or chocolate chips)); sliced almonds (for topping); powdered sugar (for topping)