Step 1: Preheat your oven to 375°F (190°C).
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Step 2: Cut the chicken breasts into bite-sized pieces and place them in a mixing bowl.
Step 3: Drain the mushrooms and add them to the bowl with the chicken.
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Step 4: Gently mix the chicken and mushrooms together.
Step 5: Roll out the puff pastry and line a baking dish with it, making sure to leave extra pastry hanging over the edges.
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Step 6: Pour the chicken and mushroom mixture into the pastry-lined dish and spread it out evenly.
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