Follow these simple steps to create your Lobster Pot Pie:

1. Preheat Oven: Preheat your oven to 400°F (200°C).
2. Sauté Vegetables: In a large skillet, melt the butter over medium heat. Add the diced onions, carrots, and celery. Cook until they soften, about 5-7 minutes.
3. Make Roux: Sprinkle the flour over the sautéed vegetables. Stir constantly for about 1 minute to create a roux.
4. Add Liquid: Gradually whisk in the heavy cream and broth. Continue stirring until the mixture thickens, about 3-5 minutes.
5. Add Lobster and Seasoning: Remove from heat and stir in the chopped lobster, peas, parsley, thyme, salt, and pepper. Mix until well combined.
6. Fill the Pie Crust: Pour the lobster mixture into a pie dish lined with your pie crust. Spread it evenly.
7. Cover with Pie Crust: Roll out the second pie crust and place it over the filling. Pinch the edges to seal and cut a few slits in the top to allow steam to escape.
8. Apply Egg Wash: Brush the top crust with the beaten egg for a golden finish.
9. Bake: Place the pie in the preheated oven and bake for 30-40 minutes, or until the crust is golden brown and flaky.
10. Cool: Remove the pie from the oven and let it cool for 10 minutes before serving.

These steps will help you create a stunning Lobster Pot Pie that will impress your family and friends.