Cut ham into 1/4 inch slices > cut slices into thin strips. You want them thin enough to bend with the pasta but not so thin they break during cooking.

Heat butter in heavy bottomed pot or non-stick > add ham slices and cook on medium heat until strips start to get a little golden sear

Add onion and saute for a few minutes until they take on the color of the sear and are translucent

Add garlic and saute until fragrant (about 2 or 3 minutes)

Turn heat to low and add cream > stir well with a wooden spoon, being sure to get any sear left on the bottom of the pot > cover with low heat > stir every few minutes while you make your pasta

Fill pot with water and prepare pasta according to package instructions

When pasta is done add one cup of pasta water to sauce

Add 1 cup of the parmesan. Stir and let cook for two minutes or until cheese is incorporated. Take off heat and serve over pasta with left over parmesan dressed on top.