In a large pan/pot (big enough for a batch of soup) melt butter over medium heat. Add garlic and onion powder and saute 1-2 minutes until garlic is fragrant. Add flour and stir until mixture comes together.Gradually whisk in milk until smooth. Add chicken broth, jalapeño juice, chicken, salt, cream cheese, cheddar cheese, and jalapeños. Stir until cheeses are completely melted. Taste and add salt and pepper to taste as needed. Serve with crispy tortilla strips if desired. Enjoy!