HEAT 1 Tbsp. olive oil in large nonstick skillet over medium-high heat and cook half of the vegetables, stirring occasionally, until they start to brown, about 4 minutes. Stir in 1/2 Tbsp. vinegar and cook, stirring, 1 minute. Remove from skillet and set aside. Repeat with remaining oil, vegetables and vinegar.
RETURN vegetables to skillet. Stir in water and Knorr® Rice Sides™ - Herb & Butter and cook according to package directions.
STIR in 1/4 cup walnuts and 1 Tbsp. Parmesan cheese. Top with remaining walnuts and Parmesan cheese.