In a bowl add the egg whites, salt and the vanilla extract. Whisk with a hand whisk or an electric beater or a stand mixer until the egg whites become fluffy, airy and forms soft peaks.
In another bowl add the peanut butter, brown sugar and the egg yolks. Mix well.
Take a little of the whisked egg whites to the peanut butter egg yolk mix and whisk well, loosen the peanut butter mix slightly.
Add the rest of the egg whites to the peanut butter mix and using a spatula fold the egg whites to the peanut butter without knocking out much air.
The batter is ready - Pour it in two greased ramekins until halfway.
Bake in a preheated oven of 200 degrees Celsius for 8-9 minutes.
Sift powdered sugar if you want on top and serve warm.
Notes
Peanut Butter - Use smooth peanut butter, for better incorporation and good rise. I haven't tried with crunch peanut butter, so check before you try this recipe.
Brown Sugar - Again, this recipe is gluten free, dairy free and slightly healthy. So use brown sugar. But if you don't have it in your pantry, use regular granulated sugar.
Eggs - You need to separate the egg yolks and whites for this recipe. The egg whites are the raising agent of the recipe, so they need to be whisked until soft airy peaks are formed. IF you miss this step, it will be like eating flour-less peanut butter cookie, not a soft slightly gooey souffle.