To make stuffed mushrooms with sour cream, you'll need: Mushrooms. You can use any type of mushroom, but I like to use red bell peppers because they're a little sweeter than other mushrooms. If you don't have any mushrooms, then you can substitute white mushrooms for the red ones. Fill each mushroom with 2 tablespoons of shredded cheddar cheese, 1 tablespoon of chopped chives, and 1 teaspoon of salt. Bake in the oven at 400?F for 20 to 25 minutes, or until the cheese is melted and the mushrooms are tender. Serve warm.