Preheat oven to 350-degrees F.
Cream butter and sugars.
Add eggs and vanilla and blend well.
In a separate bowl, mix together the oats, flour, salt, and soda.
Add the dry ingredients and butterscotch chips to the wet ingredients. Stir just until incorporated.
Roll into tablespoon-sized balls, dip tops of balls in sugar and slightly flatten. A base of a small glass works well for slightly flattening the cookies.
Bake at 350 degrees for 11-13 minutes on ungreased baking sheet. The cookies should have just the faintest hint of golden around the edges. I have had the best success with only baking the cookies for 11 minutes. I like to line my baking sheets with parchment paper; Stella B uses a Silpat. Either one works very well for creating perfect bottoms.
Cool cookies on a wire rack.