Place the cream cheese, garlic, scallions, olives, lemon juice, white horseradish, parsley, basil, thyme and salt and pepper in a food processor and process until well blended. Use as a spread on crackers, matzo, cucumber or zucchini slices or stuff into grape or cherry tomatoes. To use as a dip, stir in the yogurt or sour cream and blend in thoroughly. Makes about 2 cups.