Potato Casserole - cooking recipe

Ingredients

5 to 6 medium potatoes, diced
1 onion, chopped
2 Tbsp. butter
2 Tbsp. flour
1 c. milk
1 Tbsp. mustard
1/2 c. mayo
bacon bits

Preparation

Cook onion in butter until tender.
Add flour.
Slowly add milk.
Cook until thick.
Remove from heat.
Boil potatoes until tender and drain.
Put potatoes into 1 1/2-quart buttered casserole.
Add mustard and mayo to cream sauce.
Pour over potatoes.
Top with bacon bits.
Bake at 350\u00b0 for 30 minutes.