Pasta:
Cook pasta according to package instructions.
While pasta is cooking, cube chicken and saute until partially cooked.
Add mushrooms, red onion, and red peppers and continue cooking until chicken is cooked through and vegetables are tender-crisp.
Add chicken and vegetables to cooked noodles.
Add turkey bacon, reserving some for the top, and stir to combine.
Sauce:
Melt butter in a small saucepan. Stir in flour, salt & pepper.
Stir in milk; cook and stir over medium heat until thickened and bubbly.
Cook and stir 1 minute more.
Add Ranch dressing mix and stir to combine.
Pour over pasta.
Garnish with reserved bacon and dried dill.