Christina's Three Cheese Chicken Penne Florentine

1 t olive oil
3 c thinly sliced mushrooms
1 c chopped onion
1 c chopped red bell pepper
3 c chopped fresh spinach
1 T chopped fresh oregano
¼ t freshly ground black pepper
1 (16 oz.) carton cottage cheese
4 c hot cooked penne
2 c shredded chicken
1 c cheddar cheese, divided
½ c Parmesan, divided
½ c milk
1 can cream of chicken
Preheat oven to 425.
Heat olive oil in large nonstick skillet coated with cooking spray over medium-high heat. Add mushrooms, onion, and bell pepper; sauté 4 minutes, or until tender. Add spinach, oregano, and black pepper; sauté 3 minutes, or just until spinach wilts.
Place cottage cheese in a food processor; process until very smooth. Combine spinach mixture, cottage cheese, pasta, chicken ¾ c cheddar, ¼ c Parmesan, milk, and soup in a large bowl. Spoon mixture into a 2-quart baking dish coated with cooking spray. Sprinkle with remaining cheddar and Parmesan. Bake at 425 for 25 minutes or until lightly browned and bubbly.