CHIPPED BEEF ON TOAST

1/4 cup butter or margarine
1/4 cup all-purpose flour
2 cups milk
2 packages (2-1/2 ounces each) dried beef, cut into strips
4 slices bread, toasted and halved

In a microwave-safe bowl, heat butter on high for 45 seconds or until melted.  Stir in flour until smooth.  Gradually stir in milk.  Microwave, uncovered, on high for 3-4 minutes or until thickened, stirring every minute.  Stir in beef; cook on high for 1 minute or until heated through.