Other than tweaking the amount of brown sugar to white, this has been a family favorite cookie for going on 3 generations. My husband is always bragging on them and asking me to make batches to give to his friends and associates. There is also lots of wiggle room for variety of chips and/or nuts.
Preheat oven to 350. I use a hand blender, but standing mixer or wooden spoon work too. Blend the butter and sugars together until fluffy and well mixed. Add the eggs one at a time, then the vanilla.
Whisk the flour, oats, baking soda and salt in a large bowl, then add to the butter mixture. Beat until just blended. I use a danish whisk or spoon to mix in the chips and nuts.
Using a cookie scoop or small spoon, put rounded balls of dough onto a baking sheet lined with parchment. No need to grease pan or parchment. Bake until just starting to brown, about 13-15 minutes. I check them and rotate front to back about half way through. Let cool on the pan 1 minute, then remove them to a cooling rack. (or your mouth!)