Heat 1 Tbsp. oil in large skillet on medium heat. Add onions; cook and stir 3 min. Add spinach; cook and stir 2 min. or just until wilted. Stir in beans and 1 tsp. zest. Transfer to serving bowl.
Heat remaining oil in same skillet. Add fish, 1 fillet at a time, to flour in resealable plastic bag; seal bag. Toss to evenly coat fish with flour. Add to skillet; cook 3 min. on each side or until fish flakes easily with fork. Transfer to plate.
Add lemon juice, remaining zest and Cooking Creme to skillet; stir until blended, scraping browned bits from bottom of skillet. Cook and stir 2 to 3 min. or until heated through.
Serve salad topped with fish and sauce.
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