Step 1

Preheat oven to 350°F and grease a 9-inch pie dish with butter or nonstick spray. Line with one of the pie crusts. Set aside.

Step 2

In a large skillet over medium-high heat, melt the butter. Add the onion and cook until starting to soften, 2 minutes. Add the garlic and cook 1 minute more.

Step 3

Stir in the flour and let cook 1 minute. Gradually stir in milk, followed by the cream cheese. Cook, stirring frequently, until cream cheese melts and mixture thickens. Season with ground mustard, salt and pepper.

Step 4

Turn off heat and stir in 1 1/2 cups of the cheddar cheese until melted. Stir in broccoli and chicken.

Step 5

Pour mixture into pie shell and top with remaining cheese. Put second pie crust on top and fold and crimp edges of the crusts to seal. Cut 4 slits in the center of the pie.

Step 6

Whisk egg with 1 tablespoon of water and brush over top crust.

Step 7

Bake until golden brown, 40-45 minutes. Let rest 10 minutes before serving. Enjoy!