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.
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Notes
Yield: 24 cookies. Serving Size: 1 cookie.Cornflakes: you could substitute rice krispies or corn or rice chex cereal, lightly crushed.Coconut: Add 3/4 cup dried coconut flakes (sweetened or unsweetened).Nuts: Add 1/2 cup chopped pecans or walnuts.Make Ahead Instructions: Store cowboy cookie dough in the fridge up to 1 day in advance, before bakingTo Freeze Cookie Dough: arrange cookie dough balls on a parchment lined baking sheet and "flash freeze" for 30 minutes before transferring to a freezer safe bag or container from up to 3 months. Bake from frozen, adding a few minutes to the bake time. Freeze Baked Cookies in freezer safe bag or container for up to 3 months.