Step 1

Scrub potatoes. Add potatoes to a saucepan or skillet with water. Boil until fork tender.

Step 2

Turn off heat; add frozen peas, stir. Immediately drain off the water and add peas and potatoes back to the same skillet or pan. Put on the lid and set aside.

Step 3

In a small saucepan, cook onions in the margarine until tender (just a couple minutes).

Step 4

Add flour, salt and pepper, and cook until lightly browned. Add milk, cooking and stirring until thickened and bubbly. Continue to cook and stir for an additional 1-2 minutes. Taste the white sauce. If bland, add more salt and pepper.

Step 5

Combine the white sauce and the vegetables. Stir and serve.