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Easy Solution...!
first thinking of 1 girl missing the treat, then how many possibilities will be there ? = 5C4 then, thinking of 2 girls missing the treat, then how many possibilities will be there ? = 5C3 then, thinking of 3 girls missing the treat, then how many possibilities will be there ? = 5C2 then, thinking of 4 girls missing the treat, then how many possibilities will be there ? = 5C1
each of the girls cannot miss the cookies, otherwise the plate wouldn't have been empty, would it ?
so, add every possible solution, you get the result....!