1. Preheat the oven to 350°F and line baking sheets with parchment paper.

2. In a large bowl, cream together the softened butter, brown sugar, and granulated sugar until light and fluffy.

3. Beat in the eggs one at a time, then mix in the vanilla extract.

4. In a separate bowl, whisk together the flour, baking soda, salt, and cinnamon.

5. Add the dry ingredients to the wet mixture and stir until just combined.

6. Fold in the oats and chocolate chips until evenly mixed.

7. Scoop the dough into rounded portions onto the prepared baking sheets, spacing them about 2 inches apart.

8. Bake for 10 to 12 minutes, until the edges are lightly golden and the centers are still soft.

9. Let the cookies cool on the baking sheet for 5 minutes, then transfer to a wire rack to cool completely.