In a 3-quart sauce pot, melt margarine. Add onion, garlic, and corn syrup. Simmer 1 minute. Do NOT brown. Add flour, white pepper, salt, chicken broth, water, and vegetables. Simmer 3 minutes. Add half-and-half. Simmer until desired consistency. Stir constantly - do NOT bring to boil. Garnish with chopped parsley and serve.