meta.rb

class Sinatra::Base
  # not my code
  def self.get(url, *args)
    # method body
  end

  # my code
  def self.with_layout(url, layout, &block)
    # Basically, I want to call get, but with additional args appended
    Generic.class_eval(&block)
  end
end

class Generic
  def self.get(url)
    Sinatra::Base.get(url, { :layout => "whatever" }) 
  end
end