Combine egg whites, egg, sugar, honey, juice, vanilla, and a dash of salt. Beat with wire whisk or mixer on low speed until the mixture is light and frothy.
Stir in yogurt until smooth. Add flour; beat until smooth.
Grease bottom of a one quart casserole dish. Spread berries on the bottom, sprinkle with sugar if you like. Pour batter over top of the berries. It won't cover the whole thing, but you'll get most of it.
Pop in the oven for 25-30 minutes. Remove and slice the way you would a pie into six pieces.