Cook the chickpea pasta in boiling salted water according to package directions until al dente, then drain and set aside.
Heat the olive oil in a large skillet over medium-high heat.
Season the chicken breast with half of the Cajun seasoning, sea salt, black pepper, and garlic powder.
Add the chicken to the skillet and cook until golden brown and cooked through, about 5-7 minutes.
Remove the chicken from the skillet and add the sliced onions and bell peppers, sautéing until they are tender and slightly charred.
In a small bowl, whisk together the Greek yogurt, chicken broth, and the remaining Cajun seasoning until smooth.
Return the chicken and cooked pasta to the skillet with the vegetables.
Pour the yogurt mixture over the pasta and toss gently over low heat until the sauce is creamy and coats every ingredient.
Garnish with fresh parsley before serving.