3. Step
Without wiping the pan, melt the remaining 2 tablespoons butter over medium-high heat. Add onion, white and light green parts of scallions and chopped jalapeños; cook, stirring often, until softened, about 6 minutes. Sprinkle flour over the vegetables, stirring to coat; cook, stirring constantly, for about 1 minute. Add broth and milk; cook, stirring constantly, until thickened, 1 to 2 minutes. Add cream cheese; cook, stirring constantly, until melted, about 1 minute. Remove from heat; stir in the chicken, mozzarella and salt.