Easy Mushroom Omelet Recipe with Sautéed Onions

Name: Easy Mushroom Omelet Recipe with Sautéed Onions
Prep time: 5 min
Cook time: 20 min
Total time: 25 min
Cuisine: American
Ingredients: 1 tablespoon butter (salted or unsalted); 1 cup thinly sliced yellow onion (about 1/2 large); Kosher salt (divided use); 2 cups sliced cremini (baby bella) mushrooms (4-6 ounces); 1 1/2 teaspoons balsamic vinegar (optional); 1 teaspoon fresh thyme leaves; 6 large egg whites; 2 tablespoons milk (2% or 1%); 1 teaspoon Dijon mustard; 1/8 teaspoon ground black pepper; 2 tablespoons coarsely chopped fresh parsley (for garnish)

Instructions

Prep:5minCook:20min

Light yet satisfying, this easy mushroom omelet recipe combines sautéed cremini mushrooms, onions, thyme, and a touch of balsamic vinegar with egg whites in a tender no-flip omelet full of savory flavor.

Updated at: Tue, 12 May 2026 21:10:18 GMT