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Spinach and Mushroom Omelet

Browned mushrooms, fresh spinach, and Swiss cheese make a savory filling for individual omelets with tender, softly set eggs.

A golden folded omelet reveals browned mushrooms, wilted spinach, and melted Swiss cheese inside.

The key to a tidy spinach and mushroom omelet is managing moisture before the eggs enter the skillet. Mushrooms need time to release and evaporate their liquid, while spinach needs only a brief wilt.

Cooking two individual omelets keeps the eggs thin and tender, and gives each one enough room to fold around the warm filling.

Brown before you wilt

A wide skillet lets the mushrooms make broad contact with the hot surface. Stir them only occasionally so their moisture can cook away and their edges can brown instead of steam.

Keep the greens bright

Dry spinach collapses quickly and contributes little water to the filling. If any liquid collects after it wilts, keep the pan over the heat until the surface is dry before setting the vegetables aside.

Cremini mushrooms brown in a skillet as fresh spinach is added for a brief wilt. — Mushrooms brown first, then spinach wilts briefly in the same skillet.

Set the eggs gently

Medium-low heat gives the eggs time to form soft curds without browning. Sweep the spatula through the pan and tilt it so loose egg reaches the warm surface, then stop while the top still looks glossy.

Fill and fold while warm

Divide the filling and Swiss between the two omelets, keeping the vegetables in a narrow line so the fold closes easily. A brief moment in the warm skillet softens the cheese without pushing the egg past its tender stage.

Tender egg and melted Swiss surround distinct browned mushrooms and bright wilted spinach. — Softly set egg wraps around the browned mushroom, wilted spinach, and melting Swiss.

Serve each omelet as it is ready

The filling can be browned and wilted before the eggs are whisked, but assemble and cook the omelets one at a time. If the vegetable pan looks wet, return it to the heat first; moisture trapped inside the fold can loosen the eggs.

Spinach and Mushroom Omelet

2 individual omelets

23 minutes total

Ingredients

• 4 large eggs
• 8 oz cremini mushrooms, thinly sliced
• 2 cups baby spinach, dry
• 2 oz Swiss cheese, finely shredded
• 2 tbsp unsalted butter, divided
• 1/4 tsp kosher salt
• 1/8 tsp freshly ground black pepper
• 1 pinch ground nutmeg

Method

Prepare the filling
Thinly slice the cremini mushrooms, finely shred the Swiss, and check that the baby spinach is dry; set the cheese and spinach near the stove for quick assembly.
Look for: The mushroom slices are similar in thickness and the spinach has no clinging water.
Brown the mushrooms
Heat a wide skillet over medium-high heat and melt 1 tbsp of the butter. Add the mushrooms in one uncrowded layer and cook for 6 to 7 minutes, stirring only once or twice, until their moisture has evaporated and the edges are browned.
Look for: The pan is dry rather than pooled with mushroom liquid, and the mushroom edges have turned golden brown.
Wilt the spinach
Add the baby spinach to the mushrooms and toss over medium heat just until the leaves collapse, about 30 to 60 seconds. If liquid appears, keep tossing until the pan is dry, then transfer the filling to a plate.
Look for: The spinach is bright and just wilted, with no liquid left in the skillet.
Season the eggs
Whisk the eggs with the kosher salt, black pepper, and a restrained pinch of nutmeg just until blended; avoid beating in foam so the omelet stays tender.
Look for: The whites and yolks are combined, but the mixture is not frothy.
Set the first omelet
Wipe out the skillet and set it over medium-low heat. Melt 1 1/2 tsp butter, pour in half the eggs, and sweep a flexible spatula through the setting curds while tilting the pan so uncooked egg reaches the bare surface; stop when the top is mostly glossy and softly set.
Look for: Soft curds have formed underneath while the top still looks moist and cohesive.
Fill and fold
Spoon half the mushroom-spinach filling along one side of the first omelet and scatter on half the Swiss. Fold the bare half over the filling, let the cheese soften for about 30 seconds, then slide the omelet onto a warm plate.
Look for: The fold holds its shape and the cheese begins to soften without the eggs browning.
Cook the second omelet
Melt the remaining 1 1/2 tsp butter in the same skillet and repeat the egg-setting, filling, and folding process with the remaining eggs, mushroom-spinach mixture, and Swiss. Serve both omelets promptly while the centers are soft.
Look for: The second omelet is gently set, filled evenly, and folded with no wet vegetables escaping.