Au Gratin

This is Johnny's absolute favorite thing that we make. We have it all the time. It's so good!

6 bacon strips, diced
1 medium onion, chopped
4 cups sliced peeled cooked potatoes
1/2 teaspoon salt
1 package (10 oz) frozen peas, cooked and drained
2 cups (8 oz) cheddar cheese, divided
1/2 cup mayonnaise
1/2 cup milk

In a skillet, cook bacon until crisp. Remove with a slotted spoon to paper towels. Drain, reserving 1 tablespoon drippings. In the drippings, saute the onion until tender.

Layer with potatoes, salt, peas, 1 cup of cheese and bacon. Reduce heat: cover; and simmer for 10 mintutes or until heated through.

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