Cheddar Broccoli Casserole

Melt 2 tablespoons (30 mL) Becel® Buttery Taste margarine in medium saucepan over medium heat and cook flour, stirring frequently, 1 minute. Gradually whisk in milk. Bring to a boil and cook until thickened, about 1 minute. Stir in cheese and mustard until cheese is melted. Add broccoli and cook over medium-low heat, stirring frequently, until heated through. Turn into greased 1 ½ quart (1,5 L) shallow casserole. Combine remaining 2 tablespoons (30 mL). Spread, melted with breadcrumbs, then sprinkle over broccoli mixture. Broil until golden, about 1 minute.