French Onion Frittata
Ingredients
- 2 tablespoons unsalted butter, divided
- 2 cups diced day-old bread
- 1 tablespoon olive oil
- 2 large yellow onions, thinly sliced
- 1 1/2 teaspoons kosher salt, divided
- 1 tablespoon balsamic vinegar
- 8 large eggs
- 1/4 cup whole or 2% milk
- 1 tablespoon Dijon mustard
- 1/4 teaspoon freshly ground black pepper
- 1/2 cup diced Gruyère cheese (2 ounces)
- 1 tablespoon finely chopped fresh chives
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