Preheat oven to 375 degrees. Coat lightly a 12” pizza pan with a little olive oil to help browning and potential sticking.
Press the dough into the pan, forming a 1” crust around the edge. Prick the dough with a fork. Bake the dough for 10 minutes.
Meanwhile, in a medium skillet over medium high heat, cook the chicken, onion, bell pepper and garlic until the chicken is cooked through and no longer pink.
Stir in the tomato sauce and oregano; set aside.
Remove the crust from the oven; sprinkle drained spinach over top.
Spread the chicken sauce mixture over the spinach. Sprinkle the mozzarella and Parmesan cheese over the sauce.
Bake for 25 minutes or until the crust is lightly browned and the cheese is bubbly. Remove the pizza from the oven and let sit for 2 to 3 minutes; cut into 8 slices.