Preheat the oven to 375°F (190°C).

In a mixing bowl, combine the cream cheese, spinach, mozzarella cheese, garlic powder, onion powder, salt, and black pepper.

Place the chicken breasts on a clean surface and pound them to an even thickness.

Spread the cheese and spinach mixture evenly over each chicken breast.

Roll up each chicken breast tightly and secure with toothpicks.

Heat a skillet over medium heat and add a little oil.

Sear the chicken roll ups on all sides until golden brown, about 3-4 minutes per side.

Transfer the roll ups to a baking dish and pour marinara sauce over them.

Bake in the preheated oven for 20 minutes or until the chicken is cooked through.

Remove from the oven, let rest for a few minutes, then remove toothpicks and slice before serving.