Preheat oven to 450°. Place half of tortilla strips in a single layer on a baking sheet. Coat strips with cooking spray; bake 10 minutes or until browned and crisp, stirring once.
Sauté onion and next 2 ingredients in hot olive oil in a Dutch oven over medium-high heat 5 to 6 minutes or until browned.
Add chicken broth and remaining unbaked tortilla strips to onion mixture. Cook broth mixture over medium heat 3 to 5 minutes or until tortilla strips soften and broth mixture thickens slightly.
Stir in enchilada sauce and next 2 ingredients, and cook 6 to 8 minutes or until mixture is thoroughly heated. (Do not boil.) Serve with baked tortilla strips and desired toppings.
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