Preheat oven to 350°F (180°C) and line a baking sheet with parchment paper.
Dice the chicken breast into small cubes. Heat the olive oil in a skillet over medium heat.
Add the chicken to the skillet and sauté for 6-8 minutes, or until fully cooked through. Season with salt, pepper, and curry powder.
Once the chicken is cooked, let it cool for a few minutes. In a bowl, mix together the chicken, sour cream, and mayonnaise.
Roll out the puff pastry on a lightly floured surface and cut into equal-sized triangles.
Place a spoonful of the curry chicken filling onto the wide end of each triangle.
Carefully roll up the triangles into croissant shapes, starting from the wider end.
Brush the tops of the croissants with the beaten egg and sprinkle with sesame seeds.
Place the croissants on the prepared baking sheet and bake for 20-25 minutes, or until golden brown.
Let the croissants cool for a few minutes before serving warm or at room temperature.
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