Place a pan on medium heat and drizzle in 1 tablespoon of olive oil. Add in your slice onion, garlic, and chopped chicken breast. Fry for 5 minutes until the onions have softened and the chicken breast turns opaque.
Pour in your frozen vegetables followed by salt, pepper, dried oregano, and your seasonings of choice. I've used 'nduja paste, but you can use smoked paprika, tomato paste, chipotle paste, harissa paste, anything you fancy! Give everything a good mix.
Next up, pour in the chicken stock followed by your cream. Sprinkle in your flour to help thicken the sauce. Simmer on medium-low heat for 10 minutes until the sauce has reduced and it's creamy and slightly thicker.
Preheat the oven according to your puff pastry packet instructions. Taste your chicken pot pie and season according to your preferences. Transfer the sauce into a 9x7 inch oven-proof dish.
Lay your pre-made puff pastry over the top of your pie, sealing around the edges. Using any leftover pieces of your pastry, cut out the letters P, I, and E (this is optional), to write the word PIE on the top of your pastry. Place in the oven for 20 minutes or according to packet instructions until golden and crispy.
Once your chicken pot pie with puff pastry is flaky, puffy, golden and bubbling, take it out the oven and then serve up, top with optional chives, and enjoy!