Preheat oven to 350
Add egg whites to a large mixing bowl and set aside, at room temperature, for 30 minutes
In a medium bowl, sift 3/4 cup of cane sugar, starches and flours and set aside
Add cream of tartar, salt and vanilla to egg whites and beat at medium speed until soft peaks form
Bit by bit, add in the remaining cane sugar, beating on high speed until stiff peaks form
Gently fold in the flour mixture 1/2 cup at a time
Pour into a tube pan. Slice the mixture with a knife to remove air pockets
If you are adding chocolate chips pour in 1/2 the batter, add in 1/4 cup of chips, then add the rest of the batter and top with a few tablespoons more chips
Bake on the lowest rack for 45 minutes, looking for a lightly browned top
Flip the pan upside down onto a rack and let cool for 1 hour
Run a knife around the edges and remove from pan.
Slice and serve with fresh berries. Leftovers will last covered at room temp or in the fridge for up to 2 days