Preheat your oven to 375°F and lightly grease a small oven-safe baking dish with a portion of the olive oil.
Bring a pot of water to a boil and cook the cheese tortellini for 2 minutes less than the package instructions, then drain and set aside.
Dice the chicken breast into bite-sized pieces and season thoroughly with sea salt, black pepper, garlic powder, and dried oregano.
Heat the remaining olive oil in a skillet over medium heat and sauté the chicken until golden brown and cooked through.
In a medium bowl, whisk together the tomato puree and Greek yogurt until a smooth, creamy sauce forms.
Combine the cooked tortellini, seared chicken, and baby spinach with the sauce, tossing until the spinach begins to wilt.
Transfer the mixture into the prepared baking dish and sprinkle the parmesan cheese evenly over the top.
Bake for 15 to 20 minutes until the sauce is bubbling and the cheese has formed a light golden crust.