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French Onion Frittata

Kelli Foster
  • minutes
  • Serves 6

INGREDIENTS

1 tbsp

Chives, fresh

2

Yellow onions, large

8

Eggs, large

1 tbsp

Balsamic vinegar

1 tbsp

Dijon mustard

1/4 tsp

Black pepper, freshly ground

1 1/2 tsp

Kosher salt

1 tbsp

Olive oil

2 cups

Bread, day-old

2 tbsp

Butter, unsalted

1/2 cup

Gruyere cheese

1/4 cup

Whole or 2% milk