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In a large bowl, beat butter until fluffy; beat in brown and white sugars unil smooth, Beat in eggs, one at a timel beat in vanilla.
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In separate bowl, stir together flour, baking soda and salt; stir into butter mixture in three additions. Stir in semisweet and white chocolate.(5oz each).
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Drop by rounded tablespoons, about 2 1/2 inches apart, onto greased baking sheets; flatten slightly.
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Bake in 350f oven for about 10 minutes, until edges are golden and centres stil soft. Makes about 48 cookies.