INGREDIENTS
1/2 cup
all-purpose flour (measured by weight or using the spoon and sweep method* )
1/4 tsp
baking soda
1/4 tsp
salt
1/3 cup
peanut butter ((not natural peanut butter))
3 tbsp
unsalted butter (softened)
3 tbsp
brown sugar
2 tbsp
granulated sugar
1
large egg yolk
1/2 tsp
vanilla extract