Cook the manicotti pasta according to package instructions until al dente. Drain and set aside to cool.
In a large skillet, heat olive oil over medium heat. Add diced chicken and sauté until cooked through, about 6-8 minutes. Stir in fresh spinach until wilted.
In a mixing bowl, combine the cooked chicken mixture with ricotta cheese, garlic powder, 1 teaspoon salt, and pepper. Mix until well combined.
Fill each manicotti tube with the chicken and ricotta mixture and place them in a baking dish.
Pour the Alfredo sauce evenly over the filled manicotti and sprinkle with Parmesan cheese.
Cover the baking dish with foil and bake for 25 minutes. Remove the foil and bake for an additional 10 minutes until bubbly and golden.
Allow to cool for a few minutes before serving.
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Notes
Store leftovers in an airtight container in the refrigerator for up to 4 days. Reheat in the oven or microwave.