Name: Mushroom Filling
Total time: 20 min
Ingredients: 1 teaspoon olive oil; 1 shallot, sliced thin; 4 ounces white or cremini mushrooms, trimmed and chopped; 1/8 teaspoon table salt; 1 teaspoon balsamic vinegar

Why This Recipe Works

While developing our recipe for fluffy omelet, we realized that we had to rework traditional omelet fillings. We went with intensely flavored but lightweight ingredients that would not impede the omelet’s rise. A touch of Parmesan brought savory depth and also helped hold the filling in place.

Instructions

Heat oil in 12-inch nonstick skillet over medium-high heat until shimmering. Add shallot and cook until softened and starting to brown, about 2 minutes. Add mushrooms and 1/8 teaspoon salt and season with pepper to taste. Cook until liquid has evaporated and mushrooms begin to brown, 6 to 8 minutes. Transfer mixture to bowl and stir in vinegar.