Preheat the oven to 425 degrees
Shred a rotisserie chicken. Set aside.
To a pan just under medium heat, melt butter.
Add diced shallots, stir and cook for 10 minutes.
Add shitake mushrooms and minced garlic. Stir and cook for 5 minutes.
Add flour to the pan. Stir and cook for 2 minutes.
Add white wine, whisk and cook it out for 1 minute.
Whisk in the chicken stock and turn the heat up to high. Once is starts to thicken add the heavy whipping cream, salt and pepper. Whisk, then once boiling lower the heat to under medium and cook for 2 minutes.
Add the wheel of Boursin cheese and break up with the whisk and whisk until fully melted into the sauce. Simmer for 1-2 minutes.
Add the shredded chicken and frozen peas. Stir then turn the heat down to low. Allow the peas to slowly cook and the chicken to warm up while you make the puff pastry shells. Stir chicken mixture occassionally.
Flour a surface and roll out the puff pastry. Flour your rolling pin and gently roll out both of the sheets of puff pastry so they're flat and even in thickness. You aren't trying to thin out the dough, just make it even.
Using a knife or pizza cutter cut both sheets into 8 pieces so you have 16 puff pastry squares.
Spray two muffin pans with non-stick spray, then fill 8 puff pastry squares in the bottom of each muffin tin. You'll have to do a little folding over of the sides to make each fit.
Place a paper muffin liner into each puff pastry and fill each with pie weights, dry beans or rice for the first round of baking.
Bake the puff pastry shells for 12 minutes.
Remove the pans from the oven, remove the weights and muffin liners then put the pans back in the oven so the puff pastry bottoms cook. This will take about 10-12 more minutes.
Because the sides are folded you may have what looks to be raw spots it the bottoms of the dough cups. The best test is to pick up one of the shells, turn it over and check the bottom of the cup. If it's golden brown, it's done.
Remove the shells from the muffin tins. Stir the chicken mixture and fill the puff pastry shells with a ladle of the chicken mixture and top with flaky salt and chopped parsley. Serve hot.