Using half the Cajun seasoning, season the chicken fillets on both sides, reserving the remaining seasoning for the sauce. If the seasoning you use is very spicy, you may want to use less.
Heat olive oil in a large skillet over medium high heat. Add the chicken fillets and cook until done, about 6 minutes per side, depending on thickness.
When the chicken is done, remove it from the pan and set aside. Lower the heat to medium. Add the butter to the pan. Once melted, whisk the browned bits from the bottom of the pan. Then add the mushrooms, bell pepper and onion. Saute for 5 minutes.
Pour in the heavy cream, chicken stock, and remaining Cajun seasoning. Stir and let simmer for 5 more minutes.
Drain and rinse the Miracle Noodles. Add them to the sauce. Stir to coat the noodles. Simmer for a few more minutes until slightly thickened.
Slice or cube the chicken fillets. Incorporate the chicken before serving, or lay it over the top of each serving, as you prefer.