Preheat the oven to 375 degrees F (190 degrees C).
Beat butter
white sugar
and brown sugar together in a large bowl with an electric mixer until light and fluffy.
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Add eggs one at a time
beating well after each addition. Beat in vanilla.
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Stir together flour
baking soda
cinnamon
and salt in a separate bowl. Gradually add flour mixture to butter mixture and mix until blended.
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Mix in oats and butterscotch chips until combined.
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Drop dough by teaspoonfuls onto an ungreased cookie sheet. Bake in the preheated oven until the edges begin to brown