HOW TO MAKE IT :
- Preheat the oven to 350°F. Lightly spray a 9-inch deep dish pie dish with cooking spray. Fit one pie crust into the dish leaving enough overhang to crimp with the top crust. Set aside.
- In a medium-size skillet over medium-high heat melt the butter. Cook the green onion just until softened around 1-2 minutes.
- Add the milk and cream cheese. Cook over medium-heat stirring until the cream cheese has melted., Add the garlic salt, black pepper and ground mustard.
- Dissolve flour in 3 Tbsp cold milk until dissolved. If needed, add more milk 1 Tbsp at a time. Whisk the flour slurry into the the sauce.. Cook over medium-high stirring constantly until thickened. Once the sauce begins to thicken lower the heat and simmer for 2 minutes.
- After 2 minutes mix-in 1 ½ cup shredded cheese. Stir until melted.
- Remove from the heat and add the chopped chicken and broccoli florets. Mix until combined then pour into the pie shell. Sprinkle the top with the remaining ½ cup shredded cheese.
- Fit the second crust on top. Fold and crimp the edges of the two pie crusts together. Cut 4 slits in the middle of the pie.
- Whisk together the egg and cold water and brush over the the entire crust.
- Bake for 40-45 minutes until golden. Rest for 10 minutes before serving.
