Melt 1 tablespoon Promise® Buttery Spread in 10-inch nonstick skillet over medium-high heat and cook onion and mushrooms, stirring occasionally, 4 minutes or until almost tender. Stir in garlic and cook, stirring occasionally, 1 minute or until vegetables are tender. Stir in spinach and cook 1 minute or until wilted. Season, if desired, with fresh black pepper. Remove vegetables from skillet. Reserve 1/2 of the vegetable mixture in medium bowl and keep warm.
Combine ground chicken, carrots, green onions and remaining 1/2 of the slightly cooled vegetables in medium bowl; shape into 2 patties.
Melt remaining 1 tablespoon Spread in same skillet over medium heat and cook burgers, turning once, 8 minutes or until chicken is thoroughly cooked. Arrange burgers on rolls, then top with reserved vegetables.