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Grandma's Green Beans

This green bean casserole has been a staple at our Thanksgiving dinners for over 50 years, and it is still the most popular dish at the meal.
Prep Time1 hr
Cook Time1 hr
Total Time2 hrs
Course: Side Dish
Cuisine: American
Keyword: green bean, green bean casserole, savory, side dish, thanksgiving
Servings: 12


  • Large dutch oven
  • 2 large casserole dishes
  • Gallon size Ziplok bag


  • 6 bags Frozen French Style Green Beans
  • 15 tbsp Kerrygold Butter yup, you read that right.
  • 1 tsp Black Pepper
  • 2 tbsp All Purpose Flour
  • 3 tsp Salt
  • 3 tsp Sugar
  • 2 tbsp Dried Onion
  • 3 cups Sour Cream
  • 1.5 lbs Shredded Mozzarella
  • 1 regular box Corn Flakes


  • 30 minutes before starting, take the green bean bags out of the freezer and let thaw.
  • melt 1/2 the butter and whisk in flour to create a rue.
  • whisk in salt, pepper, sugar, and onion.
  • add green beans and warm through.
  • remove from heat and stir in sour cream.
  • use 2 tablespoons of butter to grease casserole dish.
  • spread green bean mixture into dish, set aside.
  • crush cornflakes in a zip lock gallon bag.
  • melt remaining butter, and pour into bag of cornflakes.
  • layer shredded mozzarella on top of green beans.
  • layer crushed buttered corn flakes on top of mozzarella.
  • cook at 400 covered for 45 minutes, then uncovered for 15 until cornflakes are golden.