Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
In a medium bowl, combine the ground chicken, egg, garlic powder, dried basil, sea salt, and black pepper until well incorporated.
Press the chicken mixture onto the prepared baking sheet, forming a thin and even circle approximately 8 inches in diameter.
Bake the chicken crust for 12 minutes until it is firm and the edges are just beginning to turn golden brown.
While the crust is baking, heat the extra virgin olive oil in a small skillet over medium heat and sauté the sliced mushrooms and chopped kale until they are tender.
Remove the crust from the oven and spread the marinara sauce over one half of the chicken circle, then top the sauce with the sautéed vegetables.
Carefully fold the empty half of the chicken crust over the filling to create a half-moon shape and press the edges gently.
Return the calzone to the oven for 5 more minutes to ensure it is heated through and the flavors have melded perfectly.
Serve the warm chicken calzone immediately with a side of fresh raspberries topped with dark chocolate chips for a sweet and fruity finish.