Cut your chicken into bite sized pieces and then season it on all sides with two teaspoons of the Cajun seasoning.
Cook pasta according to package directions. Prepare vegetables by dicing the red onion, bell pepper, and Roma tomatoes.
In a large sauce pan, melt the butter. Add the cubed chicken and increase the heat to medium-high. Cook until the outside of the chicken is browned, about 5-6 minutes. Add the diced onion, peppers, Roma tomatoes, and a few dashes of salt and cook another 4-5 minutes.
Add the roasted garlic, 1 Tbsp. of Cajun seasoning, and cayenne. Cook for one minute, stirring constantly to mix the spices and roasted garlic into the chicken and veggies.
Turn the heat down to low. Add 2 Tbsp. more butter and melt. Once melted, add the heavy cream and bring the pan to a simmer. Simmer uncovered for 4 minutes.
Add parmesan and stir until melted and mixed in well. Mix in your linguine and serve immediately.