After cooking, drain gnocchi, reserving 1/2 cup of pasta water in pot (do not rinse gnocchi). If using frozen corn kernels, drain with gnocchi. If using ears of corn, remove with tongs and place on a cutting board before draining gnocchi.
Cream Sauce
In a medium saucepan, combine half and half, cream cheese, salt, garlic powder, dried herb and black pepper. Cook over medium heat for 10 minutes, stirring frequently. stir in reserved pasta water. Return cooked pasta to pot. (If using ears of corn, cut kernels off cobs and add to pot. If using canned corn, add to pot now).
Pour cream sauce over pasta and gently stir to combine. Heat through for about 1 minute. Stir in arugula. Dish into individual serving bowls or plates and sprinkle with additional salt, pepper, dried herb and crushed red pepper, if desired.