1.Spray A 10-Inch Skillet With The Cooking Spray And Heat Over Medium-High Heat For 1 Minute. Add The Chicken And Cook For 10 Minutes Or Until It'S Well Browned On Both Sides. 2.Add The Stock, Garlic And Broccoli To The Skillet And Heat To A Boil. Reduce The Heat To Low. Cover And Cook For 5 Minutes Or Until The Chicken Is Cooked Through. Remove The Chicken From The Skillet And Keep Warm. 3.Stir The Flour, Milk, Mustard And Black Pepper In A Small Bowl Until Smooth. Gradually Stir The Flour Mixture Into The Skillet. Increase The Heat To Medium-High. Cook And Stir Until The Mixture Boils And Thickens. Serve With The Chicken And Noodles.