Grilled Chicken Breasts with Red Pepper Sauce

4 chicken breasts
4 teaspoons butter or margarine
1/2 cup diced onion
1 garlic clove, minced
1 red pepper, cut into strips
3 tablespoons whipped cream cheese
1 tablespoon sour cream
2 teaspoons dry white table wine or vermouth
2 tablespoons chopped fresh parsley

While chicken breasts are grilling, prepare sauce. Saut