Preheat the oven to 425°F (220°C).
Prepare the vegetables by slicing them and tossing them in olive oil, salt, and pepper.
Roast the vegetables for 20-25 minutes or until tender and golden-brown.
While the vegetables are roasting, season the diced chicken with Cajun seasoning.
In a large skillet, heat some olive oil over medium-high heat and add the seasoned chicken.
Cook chicken until browned and cooked through, about 5-7 minutes.
In the same skillet, add the shrimp and cook until pink and opaque, about 3-4 minutes.
Stir in heavy cream and remaining Cajun seasoning; simmer for a few minutes until thickened.
Return the chicken to the skillet, mixing everything well.
Serve the creamy Cajun shrimp and chicken over a bed of roasted vegetables and garnish with parsley.