Prepare pie crust mix according to package directions; roll out on floured surface to 16x11-inch rectangle.
Arrange on bottom of ungfeased 15 1/2 X 10 1/2 X 1 inch baking pan,, trimming to fit.
Combine broccoli, cheese and flour; arrange evenly over pastry.
Blend chicken broth, cream, eggs and mustard; pour evenly over broccqli mixture.
Bake at 350 °F for 35 to 40 minutes or until knife inserted in center comes out clean.