Eggs for Dinner: Spinach-and-Mushroom Frittata for Two

The refrigerator has eggs, half a carton of mushrooms and a bag of spinach. There is food in the house. Dinner is still a question.

A small frittata gives those ingredients somewhere to go: browned mushrooms and ribbons of spinach held together with eggs, a little Parmesan and enough garlic to make the kitchen smell like dinner. Put toast on the table, cut the frittata into wedges, and there is no need to coordinate a second main dish.

The part worth slowing down for happens before the eggs go in. Mushrooms release liquid as they cook; spinach brings more. Let that moisture escape in the open pan so it doesn't collect around the eggs. Then ease off the heat and let the oven finish the center.

Makes: 2 servings, half the frittata each.
Allow: About 35–40 minutes, including preparation and a short rest; use the cooking cues below rather than the clock alone.
Equipment: An 8-inch oven-safe nonstick or well-seasoned cast-iron skillet, mixing bowl, whisk or fork, spatula, instant-read food thermometer and oven mitts. Check that the skillet and handle are rated for 350°F.

What you'll need

• 4 large eggs
• 4 ounces (115 g) cremini or white button mushrooms, trimmed and sliced about ¼ inch thick
• 3 ounces (85 g) fresh baby spinach, washed if needed, dried well and roughly chopped
• 1 tablespoon olive oil, divided
• 1 small garlic clove, finely chopped
• 2 tablespoons milk
• ¼ cup finely grated Parmesan (about 20 g), divided
• ⅛ teaspoon fine salt
• ⅛ teaspoon ground black pepper
• Whole-grain toast, for serving, if you like

The small skillet matters. A large frying pan spreads four eggs too thin, making it harder to get a tender center without drying out the edges. Keep the 8-inch pan for this batch.

Give the vegetables a head start

Heat the oven to 350°F, with a rack in the middle. Whisk the eggs, milk, salt, pepper and half the Parmesan in a bowl until the whites and yolks are blended.

Warm 2 teaspoons of the oil in the skillet over medium heat. Add the mushrooms and spread them across the pan. Cook uncovered, stirring occasionally, for roughly 6–9 minutes. They will soften and release liquid before taking on patches of brown. Wait until no watery liquid remains and the pan returns to a sizzle. If the mushrooms start catching before then, lower the heat a little.

Stir in the garlic for about 30 seconds, then add the spinach in two handfuls. Turn it through the mushrooms until wilted. Continue cooking uncovered until the pan has no puddles, usually 2–4 minutes altogether. Draw the spatula across the bottom: water shouldn't run into the cleared space. Give it another minute if it does.

Add the eggs, then let the oven finish

Turn the heat to medium-low. Push the vegetables aside briefly, add the remaining teaspoon of oil and spread it over the exposed pan. Redistribute the vegetables evenly, then pour in the eggs. Gently nudge any clumps apart so each wedge gets some mushrooms and spinach.

Leave the mixture undisturbed for about 1–2 minutes, until a narrow band of egg begins to set around the edge. The middle will still be loose. Sprinkle the remaining Parmesan over the top and transfer the skillet to the oven.

Bake for approximately 12–18 minutes, checking from 10 minutes onward. Look for a set surface and a center that no longer ripples with liquid egg when the pan is gently moved. Confirm 160°F in the center with a food thermometer, keeping the probe tip in the egg mixture rather than against the skillet. That is the FDA's safe cooking temperature for egg dishes. If it hasn't reached that point, continue baking and check again in a couple of minutes.

The edges may be lightly golden while the top stays mostly yellow. Don't keep baking just to deepen the color; the eggs can become dry while you wait.

Set the skillet on a heatproof surface and leave it for 3–5 minutes before cutting. Keep an oven mitt over the handle as a reminder that it is still hot. Loosen the edges gently, cut into four wedges and serve two per person, with toast if you like.

Small changes that keep dinner simple

White button mushrooms and cremini work in the same quantity. Cheddar can replace the Parmesan: use the same weight, finely grated. There is no need to add more vegetables to make the pan look generous; extra filling also brings extra moisture and changes how the center cooks.

If a portion is left, transfer it to a shallow container and refrigerate within 2 hours, or 1 hour above 90°F, at 40°F or below. Use within 3–4 days and reheat to 165°F, following FDA egg-storage and serving guidance.

Bring the skillet to the table, set it on a trivet, and cut into wedges. The mushrooms are browned, the spinach is tucked into the eggs, and dinner is ready to share. Add toast if you like.