Slice each chicken breast longways into two equal pieces so you have 4 total pieces. Place in a bowl and cover generously with the cajun spice. My favorite brand is Tony Chachere's Original Creole Seasoning. Heat a cast iron skillet or heavy bottomed pan over medium high heat. Add 1 tbsp olive oil and butter. Once the butter is melted, add chicken to the pan. Allow to sear and cook for 5-8 min. Flip and sear for another 5-8 minute s until fully cooked through. .Turn the heat down to medium low and remove the chicken from the pan. Set aside.
For the Veggies and Sauce
Add remaining tbsp of olive oil to the pan. Add the onions and after about a minute or two, add a pinch of salt and stir into the onions. Cook for about 5 more min, stirring often. Add garlic and cook for 1 min, stirring into the onions. Splash a little chicken stock into the pan and use a flat bottomed spatula to scrap the brown bits from the bottom of the pan. Add the green beans and mushrooms and saute for about 10 minutes until the veggies are soft. Add another pinch of salt and freshly ground pepper. Stir. Turn the heat to low. Add the chicken stock and cream and stir together. Cook and reduce until the sauce is thickened.Cut the chicken into bite sized pieces and add to the pan along with any resting juices. Stir together. Taste the sauce and add more salt or pepper depending on your personal liking. Top with a spoonful of grated parm cheese and enjoy!!