Preheat oven to 375°F.
In a large skillet over medium-high heat, melt butter.
Add flour, whisk and cook for 1 minute.
Add beef broth, milk, and bouillion.
Simmer until thickened, stirring often (about 5 minutes).
Add peas, carrot, boiled potatoes, and marinated steak bites, mix well.
In a prepared 9-inch pie pan, add the bottom pie crust.
Pour the steak mixture on top of the crust.
Cover with the second pie crust.
Using a fork, seal the edges of the two pie crusts together.
Brush the top lightly with egg.
Make 4-5 small cuts in top crust to vent.
Bake for 40-50 minutes (until top crust is golden brown). (see notes for how to avoid burning the edges)