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Preheat your oven to 375°F. Lightly grease a 9x13 inch baking dish with butter or cooking spray.

If your chicken is not already cooked, cook and shred or dice it now. Set aside.

In a large skillet or Dutch oven over medium heat, melt 3 tablespoons of unsalted butter. Whisk in the all-purpose flour and cook for 1 minute, stirring constantly, to create a roux.

Gradually whisk in the whole milk until the sauce is smooth and begins to thicken, about 3-5 minutes.

Reduce heat to low. Stir in the cream cheese until fully melted and smooth. Add 1/2 cup grated Parmesan cheese, minced garlic, onion powder, Italian seasoning, salt, and black pepper. Stir until well combined.

Remove the skillet from the heat. Fold in the cooked chicken, thawed and squeezed dry spinach, drained and quartered artichoke hearts, drained diced tomatoes, and 1 1/2 cups shredded mozzarella cheese. Mix gently until all ingredients are evenly coated in the creamy sauce.

Pour the mixture into the prepared baking dish, spreading it evenly.

In a small bowl, combine the Panko breadcrumbs, 1/4 cup grated Parmesan cheese, and 2 tablespoons melted unsalted butter. Sprinkle this topping evenly over the chicken mixture in the baking dish.

Bake for 25-30 minutes, or until the casserole is bubbly around the edges and the topping is golden brown and crispy.

Remove from oven and let rest for 5-10 minutes before serving. This allows the sauce to set and prevents it from being too runny.


Preheat your oven to 375°F. Lightly grease a 9x13 inch baking dish with butter or cooking spray.

If your chicken is not already cooked, cook and shred or dice it now. Set aside.

In a large skillet or Dutch oven over medium heat, melt 3 tablespoons of unsalted butter. Whisk in the all-purpose flour and cook for 1 minute, stirring constantly, to create a roux.

Gradually whisk in the whole milk until the sauce is smooth and begins to thicken, about 3-5 minutes.

Reduce heat to low. Stir in the cream cheese until fully melted and smooth. Add 1/2 cup grated Parmesan cheese, minced garlic, onion powder, Italian seasoning, salt, and black pepper. Stir until well combined.

Remove the skillet from the heat. Fold in the cooked chicken, thawed and squeezed dry spinach, drained and quartered artichoke hearts, drained diced tomatoes, and 1 1/2 cups shredded mozzarella cheese. Mix gently until all ingredients are evenly coated in the creamy sauce.

Pour the mixture into the prepared baking dish, spreading it evenly.

In a small bowl, combine the Panko breadcrumbs, 1/4 cup grated Parmesan cheese, and 2 tablespoons melted unsalted butter. Sprinkle this topping evenly over the chicken mixture in the baking dish.

Bake for 25-30 minutes, or until the casserole is bubbly around the edges and the topping is golden brown and crispy.

Remove from oven and let rest for 5-10 minutes before serving. This allows the sauce to set and prevents it from being too runny.
