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In a mixing bowl, stir together the sugar cookie mix and the flour. (NOTE: The package recipe says to add 1 tablespoon of flour, but with the addition of the wet food colouring, I added an extra tablespoon to ensure the light bulbs would look like light bulbs once baked.) Add the butter and mix to combine. Crack the egg, pour the egg into the bowl and mix until a soft dough forms, saving the egg shell for later.