Preheat oven to 475° F. and rub a baking sheet or pizza stone with olive oil. Roll or stretch the pizza dough into desired size leaving the edges a little thicker for the crust.

In a saucepan over medium heat, heat a teaspoon or so of olive oil. Add the spinach to the pan and season with salt and pepper. Cook the spinach until it's wilted and then dump it into a bowl to cool. When the spinach is cool enough to handle, squeeze out the excess liquid.

Wipe out the saucepan and then add in the cream cheese, garlic and onion powder, red pepper flakes and milk. Whisk over medium heat until the cream cheese melts and the sauce is smooth. Add in the parmesan cheese and season with salt and pepper. Whisk again until smooth and slightly thickened and then remove from the heat.

Spoon the sauce over the top of the pizza dough leaving a small border around the crust. Top the pizza with the spinach, half the mozzarella and the chicken. Top with the remaining mozzarella and then bake for 12-15 minutes or until the crust is golden brown and the cheese is bubbly. Remove from the oven and top with chopped parsley if desired. Let the pizza cool for several minutes before cutting into slices.