Preheat your oven to 400°F and lightly grease a small baking dish.
Toss the diced chicken breast, zucchini, and red bell pepper on a parchment-lined baking sheet with olive oil, sea salt, black pepper, and garlic powder.
Roast the chicken and vegetable mixture for 15 minutes until the chicken is cooked through and the vegetables are tender.
While roasting, bring a pot of water to a boil and cook the cheese tortellini according to the package instructions, then drain well.
In a mixing bowl, whisk the large egg into the marinara sauce until completely combined and smooth.
Add the cooked tortellini and the roasted chicken and vegetables into the prepared baking dish.
Pour the egg-enriched marinara sauce over the mixture and stir gently to ensure everything is evenly coated.
Bake for 10 to 12 minutes until the sauce is set and the edges are slightly bubbling.
Remove from the oven and garnish with freshly chopped basil before serving.