01 - Preheat oven to 400°F. Grease a 9x13-inch casserole dish with cooking spray or a little olive oil.
02 - In a large skillet over medium heat, add a splash of olive oil. Sauté diced onion for 3–4 minutes until softened. Add garlic and cook another 30 seconds until fragrant.
03 - Add diced chicken breast to the skillet. Cook 5–6 minutes, stirring, until chicken is just cooked through (it will finish cooking in the oven). Remove from heat.
04 - In a large bowl, combine cream cheese, Greek yogurt, cottage cheese, mozzarella, 1/4 cup Parmesan, Italian herbs, salt, black pepper, and red pepper flakes. Mix until smooth.
05 - Fold in the cooked chicken mixture, thawed spinach, and chopped artichoke hearts.
06 - Spread the mixture evenly into the prepared casserole dish.
07 - In a small bowl, mix panko breadcrumbs with 2 tbsp Parmesan. Sprinkle this topping evenly over the casserole. Lightly mist with olive oil spray.
08 - Bake for 30–35 minutes, until the casserole is bubbly and the top is golden brown.
09 - Let rest for 5–10 minutes before serving. Garnish with fresh herbs if desired.