Step 1: Cook pasta in heavily salted boiling water until al dente.
Step 2: Drain, saving 1/2 cup pasta water.
Step 3: Heat olive oil in a skillet over medium heat.
Step 4: Sauté onion and mushrooms until tender.
Step 5: Season lightly.
Step 6: Add garlic, chicken and pasta water.
Step 7: Mix cooked, drained penne pasta, onion, diced tomatoes, spinach, Italian seasoning and cream cheese together in the skillet until the cream cheese melts and coats everything.
Step 8: Add black olives.
Step 9: Pour into Pam sprayed 9x13 casserole.
Step 10: Sprinkle mozzarella cheese over the pasta mixture. Cover baking dish with aluminum foil.
Step 11: Bake in the preheated oven 350 degrees F for 30 minutes.
Step 12: Remove foil and continue baking until heated through and beginning to brown along the edges, about 15 minutes more.
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