Belongs to ptholland Green Bean Casserole with Crispy Onions 
Sides
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Adapted a little from Alton Brown and a little from trial-and-error

serves 6
You might need to buy:
  • CRISPY ONIONS
  • butter
  • MUSHROOM SAUCE
  • Freshly ground black pepper
  • table salt
  • panko or plain breadcrumbs
  • all-purpose flour
  • vegetable or chicken broth
  • all-purpose flour
  • table salt
  • Freshly ground black pepper
  • heavy cream