Instructions:
- Heat the oven to 400ºF.
- In a large skillet, melt the Kerrygold Salted Butter over medium heat. Add the onions, carrots, celery and garlic; cook, stirring, for two minutes.
- Add the mushrooms and thyme and stir often until all the vegetables are crisp-tender, about five minutes.
- Add the flour and stir until thoroughly combined with the vegetables. Cook for three minutes, or until the flour is golden brown.
- Pour in the broth, stirring constantly, and bring to a boil. Reduce the heat to low and simmer until the filling thickens, about 3-4 minutes.
- Season the filling with salt and pepper, to taste. Add the peas, potatoes and parsley; stir to combine. Transfer the filling to a 9-by-13-inch baking dish.
- Assemble the pastry sheet on top of the baking dish and cinch the top edges with your fingers. With a knife, cut three slits for air vents.
- Bake for 30-40 minutes, until the pastry is golden brown, and the filling is bubbly.