Step 1: Preheat your oven to 350°F (175°C).
Step 2: Line your baking sheets with parchment paper.
Step 3: In a medium bowl, whisk together the flour, baking powder, baking soda, salt, and cinnamon.
Step 4: In a large bowl, cream together the butter, brown sugar, and granulated sugar until light and fluffy.
Step 5: Beat in the eggs one at a time, then mix in the vanilla.
Step 6: Gradually mix the dry ingredients into the wet ingredients until just combined.
Step 7: Gently fold in the oats and butterscotch chips.
Step 8: Drop rounded balls of dough onto prepared baking sheets.
Step 9: Bake for 10-12 minutes until edges are lightly golden.
Step 10: Cool on baking sheets for 5 minutes, then transfer to a wire rack.