Preheat the oven to 400. Place the mushroom caps on a large rimmed baking sheet.
Combine the filling ingredients and divide between the mushrooms.
Bake for 25 minutes until the sausage is cooked through.
Notes
Nutrition: this makes about 24 stuffed mushrooms for 10 servings of 2 each. The nutrition facts are for 2 pieces. There are 1.9 NET carbs per serving.Substitutions: swap the sausage for ground beef, chicken, or turkey. You can also switch out the cheddar cheese for mozzarella, pepper jack, or Colby Jack. Prep Time: you can completely make and bake the mushrooms ahead of time and store them in the fridge for up to 3 days. To Reheat: place the stuffed mushrooms on a microwave-safe plate, cover with a paper towel, and heat up for 1 minute or so until hot in the microwave. You can also heat them in the oven at 350 degrees for 12-15 minutes or until they are hot.