In a mixing bowl beat butter until soft & smooth, using an electric whisk or paddle attachment.
Add light brown sugar and mix for 2-3 minutes until it is pale and fluffy.
Add plain yogurt or milk and mix to form a creamy consistency.
Scrape down the sides with a spatula so that there are no lumps of butter.
Combine all the dry ingredients (flour, baking soda, salt) in a separate bowl and add it to the butter mixture.
Mix on low speed to form cookie dough.
Reserve ¼ cup of the chocolate chunks for topping and mix the remaining into the cookie dough.
Cover with plastic wrap and allow the cookie dough to rest at room temperature for 30 minutes – 45 minutes.
Preheat the oven to 350f (175C).
Grease and Line 2 baking sheets with baking paper.
Use 2-tablespoon cookie scoop or use a measuring spoon to portion the dough approximately (40g for each cookie dough)
Arrange the portioned dough at least 3 inches apart on the baking sheet.
Add a few chocolate chunks for topping prior to baking.
Bake for 10-12 minutes.
Use a round cookie cutter to re-shape the cookies in a perfect round shape while they’re straight out of the oven and warm.
Sprinkle sea salt If desired.