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Combine butter, and 2 and 1/3 cups chocolate morsels in a heavy saucepan.
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Cook over medium heat, stirring occasionally, until butter and chocolate melt together.
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Set aside to cool while preparing other ingredients.
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In a small mixing bowl, combine flour, baking powder, and salt and stir to combine.
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In a large mixing bowl, beat eggs, sugar, and vanilla at medium speed until combined and fluffy, about 60 seconds.
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Add flour mixture gradually to bowl, beating well. Reduce speed if needed to avoid a mess.
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Pour in chocolate mixture and beat well.
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Stir in remaining 1 and 1/2 cups chocolate chips/chunks.
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Line a baking sheet with parchment paper, or non-stick mat. (You may also use a non-stick baking spray or pan).
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Make balls the size of about 1 tablespoon and place on baking sheet.
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Bake at 350° for 7-8 minutes, or until tops are glossy. Cool for about 2 minutes on sheet or until set.
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Remove to wire rack to cool completely.