Ingredients
- 1 tablespoon unsalted butter, cut into 4 pieces and softened
- 4 tablespoons grated Parmigiano-Reggiano
- 6 large egg whites, cold (about 7 ounces if using liquid egg whites from a carton)
- 1/2 teaspoon cream of tartar
- Kosher salt and freshly ground black pepper
- 1 cup freshly grated sharp Cheddar, preferably yellow
- 3 tablespoons finely chopped fresh chives
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