In a medium bowl, mix together with a whisk or wooden spoon, yogurt, sugar, sour cream, egg, salt, baking soda, baking powder. Add flour and vanilla.

Grease or spray 3-9" layer pans and divide batter evenly between pans. (the batter will seem skimpy...but spread as evenly as you can with a spatula in each pan - layers will rise on baking).

Bake at 350 oven. Bake for only 10-12 minutes until very light brown. Cool on racks and remove from pans with a plastic spatula onto racks to finish cooling as soon as you can handle the cakes.

Layer cake layers: 1/3 sweetened whipped cream and 1/2 sweetened sliced strawberries. Then 1/3 sweetened whipped cream and 1/2 berries. Last layer just sweetened whipped cream. Decorate with berries.

Do not over cook or cake will be dry. If not using immediately place wax paper between layers and wrap in plastic. Refrigerate or freeze until ready to assemble cake.