Preheat your oven to 350°F (180°C) and line a baking sheet with parchment paper.
Lightly flour a surface and roll out the whole wheat puff pastry. Cut into equal-sized triangles.
In a bowl, combine the vanilla protein powder, almond flour, Greek yogurt, and honey. Mix until you have a creamy filling.
Spoon a small amount of the protein filling onto the wider end of each pastry triangle. Sprinkle with ground walnuts, then roll up into a croissant shape.
Place the croissants on the prepared baking sheet, ensuring the seam is facing down to prevent them from unfolding during baking.
Whisk together the egg yolk and milk. Brush the tops of the croissants with the egg wash for a beautiful golden-brown finish.
Bake the croissants for 15-18 minutes, or until golden brown and crispy.
Melt the dark chocolate. Once the croissants have cooled, drizzle the melted chocolate over them.
Sprinkle the tops with ground walnuts and serve.
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