[header] How to make cheesy chicken spinach stuffed shells [title] Preheat oven to 450 ° f (232 ° c). [title] Sprinkle chicken breasts generously with salt and pepper and roast for 30-35 minutes. [title] Bring a large pot of water to boil and add salt if you'd like. 
[step] Boil pasta shells until al dente, about 12 minutes. [title] Drain and rinse cooked pasta shells with cool water.