Preheat the oven to 350 degrees F (180 degrees C).

Beat butter, white sugar, and brown sugar together in a large bowl with an electric mixer until smooth and creamy. Beat in eggs and vanilla extract until combined.

Process oats in a blender until finely ground.

Mix ground oats, flour, baking powder, baking soda, and salt together in a separate bowl. Stir into butter mixture until combined.

Add chocolate chips, walnuts, and ground chocolate and stir until combined.

Drop golf ball-sized balls of dough about 2 inches apart onto greased baking sheets.

Bake in the preheated oven, working in batches as needed, until golden, 8 to 10 minutes. Do not overbake.