Scalloped Potatoes - cooking recipe

Ingredients

1/4 c. chopped onion
1/2 tsp. salt
1/8 tsp. pepper
2 Tbsp. margarine
2 Tbsp. flour
1 1/4 c. milk
3 medium potatoes, peeled and thinly sliced (3 c.)

Preparation

For Sauce:
Cook onion in the margarine until tender.
Stir in flour, salt and pepper.
Add milk all at once.
Cook and stir until thickened and bubbly.
Remove from heat.