Preheat your oven to 350°F (175°C).
Cream together the softened butter, white sugar, and brown sugar until light and fluffy (about 3-5 minutes).
Add the eggs and vanilla extract; beat until fully combined.
In another bowl, whisk together the flour, oats, baking powder, baking soda, and salt.
Gradually add the dry mixture to the wet mixture, stirring until just combined.
Fold in the chopped pecans, coconut flakes, corn flakes, chocolate chips, and peanut butter chips.
Scoop rounded tablespoons of dough onto a parchment-lined cookie sheet, leaving space between each cookie.
Bake for 10-12 minutes or until the edges are lightly golden.
Let cool on the cookie sheet for 5 minutes before transferring to a wire rack to cool completely.