How can I keep sweet potatoes from turning brown after peeling?

Try squeezing a little lemon juice on them.

Keep them in water until u are ready to use them

I'll soak mine in water. Added health bonus - the starch will leak out if you soak overnight.

I agree, just put yours in water right after peeling. I often get our dinner potatoes peeled and sitting in water right after lunch and they don't go brown at all.

after peeling and cutting, place them in a bowl/pot of cold water with a few teaspoons of lemon juice added. or anything acidic like lemon,lime,orange,grapefruit even a little vinegar