Start by rinsing the quinoa under cold water. In a medium pot, combine the quinoa with water or chicken broth. Bring it to a boil, then reduce the heat to low, cover, and simmer for about 15 minutes until fluffy. Remove from heat and set aside.
In a large skillet, melt the butter over medium heat. Whisk in the flour to create a roux and cook for about 1 minute until lightly golden.
Stir in the red bell pepper, artichoke hearts, and spinach. Cook for about 3-4 minutes until the spinach wilts. Pour in the milk, followed by the bouillon powder, Italian seasoning, onion powder, garlic powder, and black pepper. Stir until well combined and simmer until slightly thickened.
Add the Greek yogurt and shredded chicken to the skillet. Gently fold in the cooked quinoa until everything is evenly coated in the creamy sauce.
Transfer the mixture to a greased baking dish. In a separate bowl, combine the cheese blend, panko, parsley, and garlic seasoning. Drizzle with melted butter and mix until the crumbs are coated.
Sprinkle the breadcrumb mixture evenly over the quinoa and chicken mixture. Bake in a preheated oven at 350°F (175°C) for about 20-25 minutes until the top is golden and crispy. Let cool for a few minutes before serving!