Preheat Oven: Start by preheating your oven to 350°F (175°C). Line a baking sheet with parchment paper to ensure easy cleanup and prevent sticking.
Whisk Dry Ingredients: In a bowl, whisk together the all-purpose flour, baking soda, and kosher salt until evenly combined.
Cream Butter and Sugars: In a mixer, cream the softened salted butter and both sugars together until fluffy—about 5 minutes.
Incorporate Eggs and Vanilla: Mix in the egg and egg yolk until just combined, then add in the vanilla extract.
Combine Dry Ingredients: Gradually add the dry ingredients to the wet mixture, mixing until just incorporated.
Fold in Chocolate and Cherries: Gently fold in the semi-sweet chocolate chips and chopped maraschino cherries.
Scoop Dough: Using a cookie scoop or a tablespoon, scoop dough into 1.5 to 2 tablespoon balls, placing them about 2 inches apart on your prepared baking sheet.
Bake Cookies: Bake for 10-12 minutes or until just set. Watch for a golden edge while the center remains a bit soft.
Add Flaked Salt: As soon as they come out of the oven, sprinkle a pinch of flaked salt on top.
Cool Completely: Allow your cookies to cool completely on the baking sheet before serving.