Heat oven to 350 °F.
Line cupcake tins with paper liners, or spray with baking spray. Set aside.
Sift flour, 6 Tablespoons sugar, baking powder, and salt into a large bowl. Set aside.
In a small bowl, whisk together egg yolks, oil, water, and vanilla. Set aside.
With an electric mixer fitted with a whisk attachment, whip egg whites and cream of tartar until foamy.
Stream in ¼ cup sugar while continuing to whip.
Whip to stiff peaks. Set aside.
Pour wet ingredients over dry ingredients.
Whisk until smooth.
Fold in meringue.
Use a 3 Tablespoon cookie scoop to portion batter into prepared tins.
Bake for 18-20 minutes, until light golden brown.
Set aside to cool.