Spinach Mushroom Omelette with Parmesan
⏲ ~19 min total · prep 10 · cook 9 · 4 servings
Breakfast⏱ 20 min total🔥 3.8g net carbs⚡ ≈433 kcal/serving~8% of calories from carbs
By the KFI Test Kitchen · Tested & approved by Jason Lieu, KFI recipe editor
Published Sep 15, 2026 · Updated Sep 15, 2026
Ingredients
- 4 oz cremini mushrooms, sliced 1/4-inch thick
- 1 1/2 tbsp extra-virgin olive oil, divided
- 2 cups baby spinach
- 3 large eggs
- 1/4 cup finely grated parmesan cheese
- 1/4 tsp salt
- 1/8 tsp black pepper
Instructions
- Position an oven rack 6 inches from the broiler element and turn the broiler to high.
- Heat 1 tablespoon of the olive oil in a 10-inch oven-safe nonstick or cast-iron skillet over medium-high until it shimmers.
- Lay the mushrooms in a single layer and sauté 4-5 minutes, stirring only twice, until they squeak against the pan and show browned edges — crowding or stirring early steams them gray.
- Salt the mushrooms, add the spinach in handfuls, and toss 45-60 seconds until it just wilts. Spread the vegetables into an even layer.
- Beat the eggs with the remaining 1/2 tablespoon oil, the salt, and the pepper, pour evenly over the vegetables, and tilt the pan so the egg seeps into the gaps. Scatter the parmesan over the top.
- Reduce heat to medium-low and cook 4-5 minutes, until the edges are set and the center still looks glossy and wet.
- Slide the skillet under the broiler for 90 seconds to 2 minutes, until the center puffs and the parmesan spots deep gold.
- Loosen with a spatula, fold the omelette in half, and slide it onto a plate.
Why this recipe works
- Mushrooms in a single layer Sliced cremini, stirred twice in four to five minutes, brown at the edges instead of steaming gray. Crowding is what turns them pale.
- The broiler does the top Four to five minutes on the stove sets the edges while the center stays wet; 90 seconds to 2 minutes under the element puffs the middle and golds the parmesan.
- Oil in the eggs Half a tablespoon beaten into the eggs helps the omelette release from the pan in one piece at the fold.
Tips for making this recipe well
Squeak test
Done mushrooms squeak against the pan with browned edges. If they release water instead, the pan was crowded or stirred too early.
Oven-safe everything
The skillet goes from stove to broiler, so cast iron or a metal-handled nonstick. No plastic, no wooden grips.
Wet center is correct
Pull the pan when the center looks glossy and the edges hold. The broiler does the last of the work.
Six inches, high
Rack near the element, broiler on before the eggs go in. The pan goes under late and needs the heat already there.
Fold on the plate
Loosen the whole round, slide it out, then fold. The parmesan crust stays on top where it belongs.
Serving suggestions
Slide the omelette onto a plate, fold it in half, and cut it into wedges like a frittata; it eats warm or at room temperature, which suits a brunch table. A green salad alongside is enough company since the parmesan seasons the whole pan. At 3.8 grams of net carbs for the pan, mushrooms and spinach carry most of that small number, and the plate stays firmly keto.
Storage and meal prep
Refrigerate the wedges in an airtight container for up to 4 days. They reheat in a covered skillet over low or 30 seconds in the microwave without much loss. The freezer works if you insist: wrap wedges well, keep up to 2 months, and thaw overnight in the refrigerator, expecting a slightly looser set. The broiler gold goes soft in storage either way; a minute back under the element brings it around.
Variations worth trying
- Other mushrooms Sliced white buttons or halved shiitakes brown the same way; keep the single layer.
- Goat cheese dots Small spoonfuls over the eggs before the broiler melt into pockets.
- Kale for spinach Stem it, chop it fine, and wilt it a minute longer than the spinach needed.
- Gruyère for parmesan It melts smoother and browns paler; watch the broiler minute by minute.
Frequently asked questions
Can I skip the broiler?
You can lid the pan instead, but you lose the gold spots on the parmesan and the puff in the center. The broiler is the step that finishes the top.
Why did my mushrooms turn gray?
Crowding and early stirring. One layer, two stirs in four to five minutes; if the pan is too full, brown them in batches.
What pan can go under the broiler?
Cast iron or an oven-safe nonstick with a metal handle. Check the handle before the pan goes in; six inches from the element ruins plastic.
Can I make this for two?
Use a 12-inch skillet and double everything. A thicker set needs an extra minute under the element, so judge by the puff in the center rather than the clock.
How do I keep the eggs from sticking?
Oil film on an oven-safe pan, medium-low heat after the eggs go in, and a full trip around the edge with a spatula before you fold.
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