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Spray 3 1/2- to 4-quart slow cooker with cooking spray. Place chicken thighs in slow cooker, layering if necessary. Top with 1/2 cup of the dressing, and sprinkle with garlic; refrigerate remaining dressing for later. Cover and cook on Low heat setting 4 to 4 1/2 hours or until juice of chicken is clear when thickest part is cut (at least 165°F).