Step 1: Cook the Gnocchi (The First Cook)

Bring a large pot of generously salted water to a rolling boil. Add the package of gnocchi to the boiling water. Stir gently once to prevent them from sticking to the bottom.
The gnocchi will cook very quickly. You’ll know they are done when they float to the surface of the water, which typically takes only 2-4 minutes.
Crucial Step: Before draining the gnocchi, use a mug or a heatproof measuring cup to reserve at least 1 ½ cups of the starchy cooking water. This water is the secret ingredient for our creamy sauce.
Drain the cooked gnocchi in a colander and set aside.

Step 2: Pan-Sear the Gnocchi for a Golden, Crispy Crust

This step is what elevates the dish from good to unforgettable. In a large non-stick or cast-iron skillet, melt 3 tablespoons of the butter over medium-high heat.
Once the butter is melted and foaming, add the drained gnocchi to the skillet in a single, even layer. Do not overcrowd the pan; work in two batches if necessary.
Let the gnocchi cook, undisturbed, for 2-3 minutes per side, until they develop a beautiful golden-brown, crispy crust. They should sound and look like little toasted pillows. Once seared, transfer the crispy gnocchi to a plate and set aside.

Step 3: Build the Luscious Lemon-Parmesan Sauce

Reduce the heat under the skillet to medium-low. Add the remaining 3 tablespoons of butter. Once it has melted, add the thinly sliced garlic and the optional red pepper flakes. Cook, stirring constantly, for about 30-60 seconds, just until the garlic is fragrant and lightly golden. Be very careful not to let the garlic burn, or it will become bitter.
Remove the skillet from the heat. Immediately squeeze in the juice of half the lemon (about 2 tablespoons). The pan will sizzle—this stops the garlic from cooking further and begins to build your sauce.
Return the skillet to low heat. Pour in ½ cup of the reserved starchy gnocchi water and bring the mixture to a gentle simmer, stirring to combine.

Step 4: Emulsify for Maximum Creaminess

This is where the magic happens. Turn off the heat. Add the 1 cup of finely grated Parmesan cheese to the skillet. Stir or whisk vigorously until the cheese melts completely into the liquid, creating a smooth, emulsified sauce. The starch from the gnocchi water helps the cheese and fat bind together into a creamy, stable sauce rather than an oily, separated one.
If the sauce seems too thick, stir in more of the reserved gnocchi water, one tablespoon at a time, until it reaches your desired consistency. It should be thick enough to coat the back of a spoon.

Step 5: Combine, Garnish, and Serve

Add the crispy, pan-seared gnocchi back into the skillet with the sauce. Add the finely chopped fresh parsley and the zest from the entire lemon. Gently toss everything together until the gnocchi are thoroughly coated in the glorious sauce.
Have a taste and season with salt and freshly ground black pepper as needed. The Parmesan is salty, so you may not need much additional salt.
Serve immediately in warm bowls, with an extra sprinkle of Parmesan cheese, a bit more black pepper, and a final flourish of fresh parsley on top.