In the meantime, add the oil to a pan over medium-high heat. Add the ramps and cook until translucent and just begins to golden, 2-5 minutes, adding the red pepper flakes half way through. Turn off the heat.
Cook the pasta until just under al dente. It should be tender, but not completely cooked. Strain and reserve 1 cup of the cooking liquid.
Add 1/2 cup of the pasta water to the cooled ramps and reduce over high heat by half. The oil should be at room temperature before adding the water.
Add the pasta and stir as it cooks. Add a little more pasta water a bit at a time until the pasta is cooked and the water is absorbed, ~30 seconds. Season with salt, mix in the parmesan if you are using it, and serve.
Notes
* Want some extra creaminess? Stir up to 1 cup of grated parmesan before serving. It will no longer be a spin on spaghetti aglio e olio, and is now a spin on spaghetti alla carrettiera!