Preheat oven to 350.
In a large mixing bowl, or the bowl of an electric mixer, beat brown sugar and butter with a wooden spoon or on low to medium speed until smooth.
Beat in the egg whites and vanilla.
Add chocolate chips and chickpeas. (If using a stand mixer, beware of flying chickpeas!)
Slowly add the flour, oats, baking soda, and salt, and mix on low speed until a thick dough forms.
Drop the dough by the tablespoonful onto greased baking sheet or stone, spacing the cookies about 2 inches apart.
Press gently with a fork to flatten.
Bake until the cookies are golden brown and just set, 18-24 minutes.
Place on rack to cool.