Final answer:
Baked sausage stuffed mushroom caps need to reach an internal temperature of 160°F for 15 seconds to ensure safety from harmful bacteria like E. coli and Salmonella.
Step-by-step explanation:
The internal temperature that baked sausage stuffed mushroom caps must reach for 15 seconds is 160°F.
This temperature ensures that any potential bacteria such as E. coli or Salmonella, which might be present in ground sausage meat, are destroyed. According to the USDA guidelines, ground meats, including dishes that contain ground sausage, need to be cooked to a minimum internal temperature of 160°F to be safe for consumption.