Step 1

Preheat the oven to 400 degrees F. In an oven-safe skillet, over medium heat, add olive oil, chicken thighs, and diced onion. Season with salt and pepper. Cook for 5 minutes on each side, then remove from the pan.

Step 2

In the same skillet, add 1/2 cup chicken stock, 1/2 cup whole milk or cream, and 1 1/2 cups of the grated cheddar, garlic powder, salt, and pepper. Simmer for 5 minutes over medium-low heat until the sauce begins to thicken slightly.

Step 3

Add the broccoli florets and stir into the sauce. Then add the chicken thighs and onions into the skillet. Top with the remaining cheddar and the parmesan.

Step 4

Bake for 15-20 minutes until everything is bubbly and brown, and the chicken is fully cooked through.