Spray large nonstick skillet with no-stick cooking spray and heat over medium-high heat. Add onion and cook over medium heat, stirring occasionally, until onion begins to soften and brown, about 5 minutes. Stir in kale and cook, stirring occasionally, until wilted, about 2 minutes. Stir in cream cheese, chipotle mayonnaise, 4 tablespoons Asiago cheese and Worchestershire sauce and cook over low heat, stirring, until well blended.