Mushroom And Spinach Frittata
A golden baked frittata of browned mushrooms, wilted spinach and sweet shallot folded into eggs enriched with nutritional yeast, finished with garlic and thyme and cut into tender wedges.
Why You'll Love This Recipe
A full meal out of one skillet: eggs beaten smooth, folded over mushrooms, spinach, and shallot, and baked until it puffs into a sliceable round. It suits anyone who wants a savory, protein-rich plate without meat, and it is forgiving enough for a beginner while satisfying enough to serve to company alongside a salad. Because it holds well warm or at room temperature, it also works for people who eat on their own schedule.
There are two moves that matter. First, the mushrooms and shallots are browned properly before anything else goes in, so their moisture cooks off and they take on a deep, savory edge rather than a rubbery, wet one. Second, the nutritional yeast whisked into the eggs adds a nutty, cheese-like richness that stands in for a dairy topping, which is why the frittata tastes full and rounded even without cheese. The starting-on-the-stovetop, finishing-in-the-oven method sets the custard gently and evenly so the center stays tender.
What makes it filling is the eggs themselves, whisked with nutritional yeast for a savory, almost cheesy depth. They carry the protein that keeps a wedge satisfying rather than leaving you hungry an hour later. The mushrooms and spinach add earthy, savory bulk and a range of vegetables in a single dish, while the olive oil brings a little richness that helps everything taste complete. It is the kind of plate that feels light but holds you until morning.
Ingredients
- 10 large eggs
- 4 cups sliced mushrooms
- 4 cups spinach
- 2 shallots, minced
- 3 tbsp nutritional yeast
- 1 tbsp olive oil
- 3 cloves garlic, minced
- 1 tsp dried thyme
- 1/2 tsp salt
Instructions
- Prep the vegetables: Preheat the oven to 375°F (190°C). Wipe the mushrooms clean and slice them thin. Peel and finely mince the shallots and the garlic.
- Brown the mushrooms and shallots: Heat the olive oil in an oven-safe skillet over medium-high heat until it shimmers. Add the minced shallots and the sliced mushrooms and cook, stirring occasionally, until the mushrooms release their liquid, that liquid cooks off, and the edges turn deep golden brown, about 8 minutes. Do not crowd or stir too often, or they will steam instead of brown.
- Wilt the greens: Add the minced garlic and the dried thyme and cook until fragrant, about 30 seconds. Add the spinach a handful at a time, stirring, and cook just until it collapses and any watery liquid has cooked away. Spread the vegetables into an even layer across the skillet.
- Whisk the eggs: Crack the eggs into a bowl and beat them well with the nutritional yeast and salt until the yolks and whites are fully combined and slightly foamy.
- Combine and bake: Pour the egg mixture evenly over the vegetables in the hot skillet and give the pan a gentle shake to settle everything. Transfer the skillet to the oven and bake at 375°F (190°C) until the center is set and no longer jiggles and the top is lightly puffed, about 15 minutes.
- Rest and slice: Remove the skillet from the oven, using an oven mitt on the hot handle, and let the frittata rest for about 5 minutes so it firms up. Run a spatula around the edge, then slice into wedges and serve warm or at room temperature.
Variations
- Add a cheese finish: Crumble feta or grated hard cheese over the top before the frittata goes into the oven for a saltier, creamier result. This adds dairy.
- Sun-dried tomato and basil: Fold chopped oil-packed sun-dried tomatoes into the vegetables and scatter torn fresh basil over the top after baking for a brighter, sweeter note.
- Swap the greens: Trade the spinach for chopped kale or Swiss chard. Cook the sturdier leaves a couple of minutes longer, until they soften, before you add the eggs.
- Warm it up: Stir a pinch of red pepper flakes or smoked paprika in with the garlic and thyme for gentle heat and a smoky depth that plays well with the mushrooms.
- Roasted pepper and herbs: Add drained jarred roasted red peppers with the spinach and finish with chopped parsley for a sweeter, more Mediterranean-leaning flavor.
Storage & Leftovers
Refrigerate leftover wedges in an airtight container for up to four days. Let the frittata cool to room temperature before you cover it, so trapped steam does not make the surface watery.
Reheat gently to keep the eggs tender: a covered skillet over low heat for a few minutes, or a low oven until just warmed through. A microwave works in a pinch, but use short bursts at reduced power, since high heat turns baked eggs rubbery and can weep liquid.
To get ahead, brown the mushrooms, shallots and spinach a day early and keep them chilled, then whisk the eggs and bake when you are ready. The whole frittata can also be baked ahead and eaten cold or at room temperature, which makes it a reliable packed lunch or fast dinner.
Notes & Tips
- Dry your mushrooms: Wipe mushrooms with a damp towel rather than soaking them, since they drink up water. Drier mushrooms brown faster and keep the frittata from turning watery.
- Cook off the moisture: The most common cause of a soggy frittata is wet vegetables. Make sure the mushrooms' released liquid and any water from the spinach have fully cooked away before the eggs go in.
- Use a truly oven-safe skillet: A cast-iron or all-metal skillet moves straight from stovetop to oven. If your pan has a plastic or wooden handle, transfer everything to a greased baking dish before adding the eggs.
- Judge doneness by the center: Pull it from the oven when the middle no longer jiggles but still looks just barely soft; the residual heat finishes it as it rests, keeping the eggs tender rather than dry.
- Season to taste: Nutritional yeast is savory but not salty, so taste a browned mushroom before you commit the salt, and adjust up if you skipped a cheese variation.
- Round out the plate: A simple green salad with a lemony dressing or a slice of crusty bread turns a wedge into a fuller dinner and balances the earthy, savory richness.
Nutrition & Mindful Eating
- Eggs, mushrooms and spinach set into one another here. The eggs go custardy around everything, the mushrooms stay meaty where they were browned, and the spinach collapses into dark green ribbons that run through each slice.
- Spinach wilted at the end rather than cooked from the start keeps its color and a little of its bite, and it brings folate, vitamin K and plant iron, which the eggs beside it help your body make better use of.
- Mushrooms release a lot of water before they brown, and getting them past that point is the whole difference between a savory frittata and a wet one. What is left is dense and dark, with the B vitamins and potassium mushrooms carry.
- Shallots and garlic cooked low in olive oil go sweet and almost jammy, laying a mellow base under the eggs, and their fibers feed the bacteria living in your gut.
- Thyme and nutritional yeast are the two quiet things in here. The thyme is woody and warm through the custard, the yeast is flaky and savory, and together they give a plain-looking wedge more flavor than it lets on.
- As you eat, see how dark the mushrooms have gone and how the spinach threads through the soft egg, and take the wedge slowly enough to feel your hunger settle partway through it.
Frequently Asked Questions
Why is my frittata watery in the middle?
Almost always it is moisture from the vegetables. Brown the mushrooms until their released liquid cooks off, and cook the spinach until any water evaporates before adding the eggs. Baking just until the center sets, then resting the frittata, also helps it firm up cleanly.
Can I make this without an oven-safe skillet?
Yes. Cook the vegetables in any skillet, then scrape everything into a greased baking dish, pour the egg mixture over, and bake. The stovetop start just develops flavor in the mushrooms; the setting happens in the oven either way.
It tastes flat even with the salt. What am I missing?
Nutritional yeast adds savoriness but not saltiness, so the dish leans on properly browned mushrooms and enough salt for depth. Taste as you go, make sure the mushrooms took on real color, and a squeeze of lemon or a pinch more salt at the table usually brings it to life.
Can I serve this cold or is it only good hot?
It is excellent at room temperature or straight from the fridge, which makes it a great packed lunch or make-ahead dinner. Reheat gently over low heat if you prefer it warm, since high heat makes baked eggs rubbery.