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Make Ahead Green Bean Casserole
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4 from 1 vote

Make Ahead Green Bean Casserole Recipe

This easy Make Ahead Green Bean Casserole can be baked from frozen, and taken out the day of! With a sauce made from scratch with no canned soup- this fresh to frozen casserole is a great way to make a classic favorite ahead of time!
Prep Time10 minutes
Cook Time1 hour 30 minutes
Cooking without freezing45 minutes
Course: Dinner, Side Dish
Keyword: casserole, green bean, thanksgiving
Servings: 8

Equipment

  • 9"x6" (roughly) sized metal or ceramic baking dish
  • plastic wrap
  • aluminum foil

Ingredients

  • 1 lb frozen (or fresh) petite green beans trim ends, if fresh
  • 2 tablespoon butter
  • 1 medium Onion, diced
  • salt and pepper, to taste 
  • 8 oz fresh button mushrooms, sliced thinly 
  • 2 cloves minced garlic 
  • 2 tablespoon all-purpose Flour
  • 1 14.5 oz can chicken broth
  • ½ cup half and half
  • 1 teaspoon Worcestershire sauce
  • 2 teaspoon soy sauce 
  • 1 ½ cups French fried onions/ crispy onions 

Instructions

  • Prepping the Casserole:
    1. In a medium saucepan, boil green beans for 4-5 minutes, then transfer to an ice bath to cool. Drain well, removing any excess liquid.
    2. In a deep sauté pan, melt butter over medium heat.
    3. Add onions, and season with salt and pepper.
    4. Cook, stirring occasionally, 2-3 minutes.
    5. Add mushrooms, and cook, stirring occasionally 5-6 minutes.
    6. Add garlic until just fragrant, 1 minute.
    7. Add flour and stir well.
    8. Whisk in chicken broth, Worcestershire sauce, soy sauce, and half and half.
    9. Cook 6-8 minutes until thick, stirring occasionally.
    10. Fold in drained green beans, and cook 2-3 minutes more.
    11. Transfer to greased ceramic or metal baking dish (about 9”x6”), and allow to cool completely to room temperature.
    12. Cover with a layer of plastic wrap, then with aluminum foil.
    13. Freeze for up to 2 weeks.
    To Bake:
    1. Preheat oven to 350 degrees. Take dish out of freezer while oven is preheating.
    2. Uncover and remove plastic wrap. Rewrap dish with new foil.
    3. Bake covered for 1 hour.
    4. Uncover, and stir well.
    5. Top with even layer of crispy onions and bake for 30 minutes, uncovered, until onions are browned, and casserole is bubbly.
    If Cooking right away:
    1. If you are not freezing the casserole- bake for 20 minutes covered, and 25-30 uncovered.