Preheat the oven to 375 degrees F (190 degrees C). Line cookie sheets with parchment paper.
In a medium bowl, stir together the melted butter and brown sugar until smooth. Beat in the eggs one at a time. Combine the flour, baking powder and baking soda, gradually stir into the sugar mixture. Fold in the chocolate chips. Drop by rounded spoonfuls onto the prepared cookie sheets.
Bake for 8 to 10 minutes in the preheated oven. Allow cookies to cool on baking sheet for 5 minutes before removing to a wire rack to cool completely.
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