Easiest Half-Batch Chocolate Chip Cookies (One Bowl, No Mixer Required)

INGREDIENTS

1/3 cup

salted butter

1/3 cup

light brown sugar (packed)

3 tbsp

white sugar

2 tsp

vanilla extract

large egg yolk*

3/4 cup

white all-purpose flour (NOT packed into the measuring cup)

1/2 tsp

baking soda

1/3 cup

high quality milk-chocolate chunks + 2-3 tablespoons chocolate chips**