Cajun-spiced chicken breasts stuffed with peppers and onions and ooey gooey cheese. This easy dinner is bursting with flavor! Serve plain, with rice, or over buttered pasta.
Heat the olive oil in a heavy skillet over medium-high heat. Add the sliced mushrooms, diced bell peppers (red and green), and diced onion. Cook, stirring occasionally, for about 5 minutes or until the vegetables are softened but not fully cooked. Remove from heat and set aside.
If your chicken breasts are thick, use a sharp knife to butterfly each breast by slicing them in half horizontally, without cutting all the way through, so they open like a book. Alternatively, pound the chicken breasts with a meat tenderizer to about 1/4-inch thickness.
Spoon the cooked vegetable mixture evenly onto each chicken breast. Top each with a generous pinch of shredded pepper jack cheese. Carefully fold the chicken breast over the filling, making sure the edges meet to enclose the stuffing. Secure each breast with toothpicks.
Place the stuffed chicken breasts in a lightly greased baking dish. Sprinkle each breast evenly with 1 teaspoon of Cajun seasoning. Place 1 tablespoon of salted butter on top of each chicken breast.
Transfer the baking dish to the preheated oven and bake for 30-40 minutes, or until the chicken reaches an internal temperature of 165°F (74°C). Check the temperature at the thickest part of the chicken.
Once the chicken is fully cooked, remove it from the oven and discard the toothpicks. Serve the chicken whole, or slice each breast in half or into 1-inch slices for easier serving.