Heat oven to 375℉. Line baking sheets with parchment paper or silicone baking mats.
Using an electric mixer (I use a stand mixer), cream room temp butter and both sugars together. Mix in eggs and vanilla just until incorporated. Don't over mix.
Whisk together flour, oatmeal, salt, baking powder and soda, and cinnamon in a separate bowl. Add to wet mixture a little at a time and, again, mix until just combined.
Fold in one at a time- chocolate chips, chocolate chunks, then nuts. The dough will be really thick and chunky, so for this step I switch my mixer paddle to my dough hook to make mixing easier.
Using a cookie scoop, scoop out the dough and roll into balls and place on cookie sheet about 1 inch apart.