Season chicken with salt. Melt 1 tablespoon Country Crock® Spread in large nonstick skillet over medium-high heat and cook chicken, stirring occasionally, until thoroughly cooked, about 5 minutes; remove and set aside.
Melt 1 tablespoon Spread in same skillet; add squash and onion and cook, stirring frequently, until almost tender, about 5 minutes. Add tomatoes; cook, stirring frequently, until softened, about 3 minutes.
Stir in chicken, remaining 2 tablespoons Spread, and if, desired, parsley. Season, if desired, with ground black pepper.