Preheat oven to 350 degrees F (180 degrees C). Line two baking sheets with parchment paper.

In a large bowl or in the bowl of a stand mixer, cream the butter and sugars together. Add eggs and vanilla then mix until incorporated.

Add flour, baking powder, baking soda, salt, and oats then stir well to combine. Stir in corn flakes and chocolate chips.

Scoop cookie dough into 24 balls (about 3-Tablespoons-size/55 grams)and place on prepared cookie sheets.

Bake at 350 degrees F (180 degrees C) for 10-15 minutes or until set on the top.