Roll puff pastry sheet into a 12-inch square on a lightly floured surface. Cut into 16 (3 inch) squares. Set aside.
Set oven temperature to 400 Degrees.
Remove the skin from the rotisserie chicken and shred the meat.
Set skillet on the stove top and turn heat to medium high. Melt the butter and add Canola oil. When butter sizzles, add carrots. Allow carrots to saute' for 4 minutes then add the onions and saute' the vegetables until they are tender enough to be easily pierced with a fork. 6-8 minutes.
Sprinkle the 6 Tb. of flour over the vegetables, stir and cook the flour and vegetable mixture for 1 minute.
Pour the chicken broth into the skillet and gently stir to incorporate the broth and flour mixture. Simmer the ingredients for 3-4 minutes until thickened.
Adding cream is a choice. If you wish, add the cream now, otherwise, continue with the recipe without cream.
Add Spicy Beer Mustard, chicken, peas, thyme, salt, pepper and parsley (if using).
Taste, and season more if desired. Check the consistency of the sauce. If too thick add more broth. Remove from heat.
Combine the egg with the water and whisk until blended. Brush the pasty squares with the egg wash: arrange the squares on top of hot chicken mixture in skillet, slightly overlapping so entire surface is covered. Place skillet on a rimmed baking sheet.
Transfer baking sheet to preheated oven. Bake until top is browned and filling is bubbly about 20 minutes. Remove from oven and let stand 10 minutes. Serve.