I like this style of omelet because it’s quick and simple, and it doesn’t require removing the extras from the pan and then stuffing them back in. Your “fillings” will be cooked into the outside of the omelet, with melty gooey cheese layered inside. This recipe is super flexible, too! You can add or substitute leftover vegetables of any kind if you don’t have spinach and mushrooms on hand—peppers, kale, broccoli, asparagus or whatever is taking up space in the fridge. If they’re already cooked, just chop into smallish pieces and toss them in the pan long enough to warm them and proceed with the recipe from there. As with most my recipes, I rely on formula and technique more than the ingredients. So, let’s talk about that:

How do you make an omelet fluffy?

Whisking cold water (not milk!) into the eggs just before cooking them gives a nice airy lift to the omelet. The scientific upshot is that the tiny water droplets evaporate quickly in the heat of the pan, creating airy pockets inside the egg mixture. If you want even more fluff, separate the eggs before you begin (this works best when they’re cold) and whip the whites into a soft foam (this works best at room temperature). Fold this into the rest of your egg mixture just before pouring into the hot pan.

Which cheese melts best for an omelet?

Good melting cheeses include Monterey jack, cheddar, Colby, Muenster, Havarti, Gouda and gruyere. Hard or crumbly cheeses such as feta, chevre and parmesan will add tons of flavor; just don’t expect gooey goodness from them, as they pretty much hold their shape when warmed. Whenever possible, grate your cheese from a block. The packaged pre-shredded cheeses are coated to prevent sticking in the bag, and this also prevents them from melting well.

Do you need a special pan for an omelet?

Years ago, my mom had one of those hinged, fold-over pans “designed for omelets,” but this is absolutely not necessary. It didn’t produce a fabulous omelet and mostly just made a mess. My go-to pan for omelets is a good non-stick skillet with curved sides. The shape and coating makes it easier to slide your spatula underneath the set egg mixture for folding and serving. If your skillet is not coated, swirl in a little extra oil just before adding the eggs, to guard against sticking.

This recipe is a delicious way to work in an extra serving of vegetables and works especially well as “breakfast for dinner.” Three eggs make just the right size for my husband and me to share, but we are not big eaters at breakfast. Feel free to throw in a fourth egg with no other adjustment needed.

Ingredients

Extra virgin olive oil, salt and pepper

1 thick slice of onion, finely chopped (we like sweet onions, but red or yellow ones are fine)

3 to 4 mushrooms, cleaned and sliced (cremini is my go-to, but white button or shiitake would also work)

Big handful of fresh baby spinach, roughly chopped and tough stems removed

3 large eggs, room temperature

About 1/2 tsp. prepared Dijon mustard (or hot sauce for a spicier twist)

Splash of cold water

1/3 cup freshly shredded cheese (or less if using more pungent cheese, such as Parmesan or feta)

Tools

Get Cooking!

Place a 10 inch non-stick skillet over medium heat and add a generous swirl of olive oil.

When you notice the oil beginning to shimmer and flowing easily around the pan, add your chopped onions. Give them a stir and cook until they are just soft but not quite browning, about 2 minutes. Add the sliced mushrooms and toss them around with your wooden utensil to be sure they get lightly sautéed on both sides. Add the chopped baby spinach leaves and stir until wilted and noticeably reduced, but still bright green. Salt and pepper to taste.

While the veggies are doing their thing, crack your eggs into a large measuring cup, add Dijon mustard (or hot sauce) and whisk briskly until lightly foamy. Add a splash of cold water – about 1 Tablespoon – and whisk again until light and foamy. You want lots of bubbles in this mixture, so whip it…whip it good!

Spread out the sautéed veggie mixture evenly in your pan. Slowly pour the eggs around the outer edge of the mixture, encircling your veggie ingredients, then pour gently to “fill in” and cover the entire mixture. Again, salt and pepper. Reduce the heat to medium-low and cook about 2 or 3 minutes, or until the egg mixture looks set about one half inch around the edges but still wet and somewhat loose in the center.

Sprinkle shredded cheese over the entire mixture, turn off the burner and place a cover over the pan, allowing trapped heat and steam to finish cooking the eggs and melting the cheese into them. This will take about 3 minutes. Using a wide silicone spatula, fold in half. Or for a slimmer omelet, fold one third toward the center, then fold the other side over the top of that, as if folding a letter. Carefully cut the omelet in half crosswise to share the other half with your other half, and enjoy!

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