Begin by bringing a large pot of salted water to a boil. Add the gnocchi to the boiling water and cook according to the package instructions, usually around 2-4 minutes, or until they float to the surface.
Once cooked, carefully drain the gnocchi in a colander and set aside. Reserve a small cup of the pasta water in case you need to adjust the sauce later.
In a large skillet, melt 1-2 tablespoons of butter over medium heat. Once melted, add the pesto and stir for about 1 minute to allow the flavors to meld.
Pour in 1 cup of heavy cream and stir well to combine with the pesto. Let the mixture simmer for about 3-4 minutes, allowing it to thicken slightly.
Add the cooked gnocchi to the skillet with the creamy pesto sauce. Toss gently to coat the gnocchi evenly. If the sauce is too thick, add a little reserved pasta water until you reach your desired consistency.
Taste the dish and season with salt and pepper as needed. Once everything is well combined and heated through, serve your Creamy Pesto Gnocchi hot, garnished with extra pesto or grated Parmesan if desired.