In a frying pan over medium high heat, add bacon. Cook until crispy and remove to paper towel covered plate.
In a sauce pan over medium high heat, add chicken broth, chicken and garlic. Boil for 20 minutes. Remove from pan and chop into bite-sized pieces.
Add pasta to boiling water. Cook as directed on package. Drain in a colander and rinse with cool water. Return to pot away from heat.
In a sauce pan over medium heat, add butter and garlic salt. Once melted add flour and mix together. Cook for 3 minutes then whisk in broth and ground mustard. Cook for 3 minutes and add green chilies. Cook another 2 minutes then whisk in heavy cream. Cook for 2 minutes and add cheese (one handful at a time) until completely melted.
Pour cheese sauce over cooked pasta. Add chicken and half of bacon. Stir until fully combined. Serve in a shallow pasta bowl and garnish with remaining bacon and scallions.
Keyword bacon, cheese sauce, Chicken, mac & cheese, Pasta, pasta dishes, spicy