Heat butter in pan, add zucchini, stir over medium heat for 2 minutes, or until zucchini are just soft. Blend or process cheeses, milk garlic and mint until smooth. add to zucchini mixture, stir gently until heated through. Add pasta to large saucepan of boiling water, boil, uncovered until just tender; drain. Return to saucepan, gently stir in zucchini mixture.