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In a bowl, thoroughly mix the flour, baking soda and powder, salt, and sugar.
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Add the butter and with a fork (or your fingers) rub it in until it resembles fine breadcrumbs. (you can also do this step in a food processor)
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Add the egg and continue mixing until dough comes together in a mass. You will have to use your fingers to bring it together
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Evenly divide the dough in half and place on a parchment paper-lined baking sheet. Place approximately 5 inches apart, the cookies will spread while baking. Slightly flatten the dough to 3inch wide.
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Bake for 15-17 minutes AT 350oF (180oC). Set baking sheets on a rack to cool.
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Once cooled sandwich your cookies together with buttercream frosting mixed with sprinkles
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Enjoy your cookies immediately. Store in an airtight container for up to 2 days