Combine flour, baking soda, salt, and cinnamon in small bowl.
Beat the butter, granulated sugar, brown sugar, eggs, and vanilla extract in the large bowl. Gradually beat in the flour mixture. Stir in your oats and morsels.
Drop the rounded cookie dough onto your baking sheets. Bake for 7 to 8 minutes for chewier cookies or 9 to 10 minutes for crisp cookies.
Set your oatmeal scotchies on baking sheets for 2 minutes to cool. Place cookies on wire racks to cool completely until they're room temperature.