Add the Ice cream, ice and 1 cup of soda to a blender and mix.
Add more soda if needed for a thinner consistency.
Once blended add a generous squeeze of butterscotch sauce and blend. You want to add it at the end since it tends to clump to the side of you add it from the start. I also recommend grabbing a pack of Wet-Nap wipes since the butterscotch is SO sticky and stringy that you’ll want to be able to wipe your hands quickly and easily. I find this works the best. I found mine at Walmart. They have them in the napkin isle and sometimes in the hygiene isle by other baby and lady wipes.
Pour into cup and if using whipped cream add that.
Then finish with an extra drizzle of butterscotch sauce.