Heat water to a simmer. In a large bowl, add potato flakes, then slowly whisk in hot water. Let cool slightly (so you don't scramble the eggs), and add in the egg, egg yolk, Parmesan, and salt. Slowly mix in the flour to combine (your hands are the best tool).
Once flour is incorporated, roll dough out onto a floured surface. Gently knead the dough until it is tacky, yet smooth (kinda like me...), 4-5 minutes.
Prepare a large pot of salted water to boil to cook these gnocchi (just like you would for pasta).
Cut dough into quarters; roll each quarter into a snake (1/2" inch thick, doesn't have to be exact), then cut into gnocchi (roughly double the thickness of the roll). Boil gnocchi for 3-4 minutes or until they float. Once they float, remove and serve immediately; I like a simple sauce of butter and lemon!