Sauté Chopped Jalapeño: In a cast-iron skillet over medium heat, melt butter. Add chopped jalapeño and cook for about 1 minute, stirring occasionally.
Add In Ingredients And Stir: Stir in 1 cup (84g) shredded cheddar, heavy cream, whole milk, cream cheese, green chiles, and spices. Cook until cream cheese has melted and mixture is smooth. Then, stir in shredded chicken.
Top With Shredded Cheese: Reduce stovetop heat to low, flatten mixture in skillet into even layer, then sprinkle on remaining ⅓ cup (28g) shredded cheddar. Cook until cheese topping is melted and bubbling, about 5 minutes.
Garnish And Serve: Garnish with chopped green onions and serve.