Season chicken chunks with half of the Italian Seasoning.
In a large saute pan over medium high heat, add half of the oil. Saute chicken until you no long see pink (do not cook all the way through at this stage.) Push chicken to one side of pan and reduce heat to medium.
Add remaining oil to pan along with bell peppers, onions and garlic. Saute for 3 minutes then push to side with chicken.
Add butter to pan and let melt. Whisk in flour and let cook for 3 minutes. Add chicken broth, diced tomatoes and remaining Italian seasoning. Stir vegetables and chicken into the liquid.
Add broken pasta to pan and work it around until the pasta is completely submerged. (add some water or more broth if you need to). Cover pan with lid and let cook for 20 minutes.
Remove lid and stir in heavy cream. Once fully incorporated, add in cheese. Stir until melted in. Let cook another 5 minutes before serving.
Notes
Italian Seasoning
Keyword bell peppers, cheddar, cheddar cheese, cheesy pasta, Chicken, chicken and pasta, onions, spaghetti, tomato