Preheat the oven to 375 deg F and prepare two baking sheets
In a bowl, whisk together the flours, baking powder, baking soda, and salt.
With an electric mixer, or by hand, beat the butter until soft.
Add the sugar and beat until creamy. If using a mixer, stop it once or twice and scrape down the sides.
Add the eggs one at a time until completely incorporated, then the vanilla.
Add the flour mixture in three batches, incorporating it as you go.
Mix in the oats and chocolate chips.
The dough is quite stiff at this point, and if you’re not using a powerful standing electric mixer, you may wish to roll up your sleeves and use your hands, as I did.
Drop mounds, about two tablespoons of dough each, evenly-spaced onto the baking sheet.
Bake for 10-12 minutes, until just beginning to set.
(Don’t overbake these. If anything, underbake them)