Season the chicken breast evenly with half of the Cajun seasoning, sea salt, and black pepper.
Heat the olive oil in a large skillet over medium-high heat and sear the chicken for 5 to 6 minutes per side until golden brown and cooked through.
Remove the chicken from the skillet and set aside on a plate.
In the same skillet, add the sliced bell peppers and yellow onion, sautéing for 4 to 5 minutes until they begin to soften.
Add the minced garlic, tomato paste, and the remaining Cajun seasoning, stirring constantly for 1 minute to release the aromatics.
Lower the heat to medium and pour in the full-fat coconut milk, scraping the bottom of the pan to incorporate the flavorful browned bits.
Simmer the sauce for 2 to 3 minutes until it thickens slightly, then return the chicken to the pan to coat it thoroughly.
Garnish with freshly chopped parsley before serving.