One-Skillet Spinach and Four-Cheese Lasagna Step-by-step instructions

Before you start

Before starting, ensure all ingredients are measured and ready to go. Mince the garlic and dice the onion finely to ensure they cook evenly. Shred the mozzarella and provolone if using blocks, and have the ricotta measured and at room temperature for easier dolloping.

Clean and dry the spinach leaves. Check that your skillet is clean and that you have a heat-resistant lid that fits snugly to maintain the steam required for cooking the pasta sheets properly throughout the simmering phase.

Instructions

Sautéing Aromatics

1. 1Sauté Aromatics
   Heat the olive oil in a large enameled cast-iron skillet over medium-high heat. Add the diced onion and minced garlic. Sauté for about three minutes until the onion becomes translucent and the garlic is fragrant, ensuring the garlic does not brown too quickly.
   Look for Onions are soft and translucent
   Tip Keep the heat medium to prevent burning the garlic.

The onions should be completely soft and translucent, and the garlic should be fragrant without any dark brown spots. The oil should be shimmering and coats the base of the skillet evenly. This initial step builds the aromatic foundation of the dish, so take the time to ensure the vegetables are properly cooked through before adding the liquids and pasta to the pan.

Simmering the Pasta

2. 2Simmer the Noodles
   Break the lasagna sheets into smaller pieces directly into the skillet. Pour in the San Marzano marinara and the broth. Stir gently to ensure the noodles are mostly submerged in the liquid. Cover the skillet and simmer at 203°F (95°C) for twelve minutes until the noodles are al dente.
   Look for Noodles are tender but firm
   Tip Stir halfway through to keep noodles from sticking.

The sauce should be at a consistent, gentle simmer with steam rising from the covered skillet. The noodles should be submerged. Check that the sauce has thickened slightly and the noodles are pliable. Stirring occasionally ensures that the starch is evenly distributed and that no noodles are sticking to the bottom of the pan, which would result in uneven cooking or burnt areas.

Broiling to Finish

3. 3Fold, Top, and Broil
   Remove the lid and fold in the baby spinach until it wilts into the sauce. Dollop the ricotta over the surface and sprinkle evenly with mozzarella, provolone, and Parmesan. Place the skillet under a 428°F (220°C) broiler for three to five minutes until the cheese is bubbly and golden brown. Garnish with fresh basil before serving.
   Look for Cheese is melted and golden
   Tip Watch the broiler closely as cheese browns very fast.

The cheese should be bubbling across the entire surface of the skillet. The mozzarella and provolone should be melted and stretchy, while the Parmesan provides a salty, golden crust.

The spinach should be wilted and integrated into the sauce. Once these visual cues are met, the lasagna is ready to be removed from the broiler and allowed to rest before the final assembly and serving.

Common mistakes

A common mistake is overcrowding the skillet, which prevents the noodles from cooking evenly. Ensure the lasagna sheets are broken into manageable, bite-sized pieces and are submerged in the liquid.

Another error is using too little liquid; the noodles need enough marinara and broth to rehydrate. If the sauce looks too thick before the noodles are finished, add a small splash of water or extra broth. Avoid skipping the resting period, as the sauce will be too loose to serve properly.

How to tell it’s done

The lasagna is done when the pasta sheets are tender to the bite and the sauce has thickened to a rich, clinging consistency. The cheese topping should be completely melted, with golden brown spots from the broiler.

If you prefer a deeper browning, leave it under the broiler for an extra minute, but monitor it constantly to prevent burning. Let the dish rest for five minutes off the heat before serving to allow the sauce to set and the flavors to meld together perfectly.