- Portion size 4 servings
- Credits : marypelo23
MethodCover potatoes with boiling salted water in a saucepan. Cover and simmer about 15 minutes until fork tender. Drain and set aside.
Melt butter in a saucepan. Add onions. Saute over medium heat until soft but not brown. Sprinkle with flour. Add salt and pepper. Slowly add half-and-half, cooking and stirring constantly until sauce thickens.
Remove from heat. Cool slightly. Add mustard and mayonnaise. Stir until blended, and the sauce is thick and creamy.
Turn potatoes into buttered 1-1/2 qt. casserole. Cover with sauce. Bake at 350°F for about 30 minutes. Sprinkle with crumbled bacon and thyme and serve.