Question: how many tablespoons is one medium onion?
Answer: Medium Onion: Produces about 1 cup of chopped onion. Use 1 tablespoon of onion powder or 3 tablespoons of dried onion flakes as a substitute. Large Onion: Produces about 1 1/2 cups of chopped onion. When substituting, use 1 1/2 tablespoons of onion powder or 4 1/2 tablespoons of dried onion flakes.