Preheat oven to 350°F.
Whisk together the all-purpose flour, baking soda, baking powder, and salt in a medium mixing bowl.
In your mixer, cream the butter, brown sugar, and granulated sugar until the mixture is light and fluffy. Mix in the egg and vanilla extract.
Gradually add the flour mixture, mixing until just combined. Carefully stir in the puffed rice, cereal, rolled oats, chocolate chips, and sweetened coconut.
Scoop heaping tablespoon of the cookie dough onto sheet pans, spacing them about 2 inches apart.
Bake for 9-12 minutes or until the edges turn golden brown. Allow the cookies to cool on the sheet pan.