Preheat oven to 175C/350F.

In large bowl mix together all the dry ingredients.

Add egg whites, vanilla and stir just until incorporated (do not over mix). Consistency will resemble a brownie-like mixture, thick and fudgy.

Drop dough by tablespoonful on parchment-lined cookie sheet, leaving at least 2” between each.

Bake until cookie tops are dry and crackled, approximately 15 minutes. Let cookies cool on cookie sheets before removing. Store in airtight container for up to 3 days