Preheat oven to 350 degrees
In a large mixing bowl, beat 1 cup butter until creamy
Add brown sugar, granulated sugar and vanilla extract, and beat until creamy
Add eggs, and beat well. Gradually mix in the flour, then add baking soda, sea salt and cinnamon, and mix well
Stir in the oats, and mix until well combined, then stir in chocolate chips
Drop by rounded teaspoonfuls (or use cookie scoop) onto ungreased baking sheets (silicone baking mats or parchment paper recommended), leaving about 2 inches between each cookie
Bake for 10 minutes, or until edges are lightly browned and semi firm
Remove from oven, allow to cool slightly, then transfer to wire rack or cool surface to cool completely