Blend 2 cups of water into flour mixture to make a paste. Blend remaining flour, thyme, oregano, paprika, curry and mustard; stir until smooth. Cook for 20 minutes stifling frequently.
Stir constantly while adding remaining water and milk. Cook until mixture thickens.
Cook carrots until tender crisp; drain. Thaw and drain cauliflower and broccoli. Add vegetables to sauce.
Scale 6 pounds of vegetable mixture into each of two greased 12" x 10" x 2" pans, top each pan with 1 1/2 pounds potato puffs. Bake at 350°F for 50-60 minutes or until potatoes are browned; serve hot.