Step 1

In a large skillet, cook bacon until crisp. Remove with a slotted spoon to paper towels. Drain, reserving 1 tablespoon drippings in pan. Saute onion in drippings until tender.

Step 2

Layer with potatoes, salt, peas, 1 cup cheese and bacon. Reduce heat; cover and simmer until heated through, about 10 minutes.

Step 3

Combine mayonnaise and milk until smooth; pour over bacon. Sprinkle with the remaining cheese. Remove from the heat; let stand for 5 minutes before serving.