Instructions
Step 1: Preheat the oven to 350°F (175°C) and line baking sheets with parchment paper.
Step 2: In a medium bowl, whisk together the flour, baking soda, cornstarch, and salt.
Step 3: In a large bowl, whisk the melted butter, brown sugar, and granulated sugar until smooth.
Step 4: Add the egg, egg yolk, and vanilla extract, mixing until fully combined.
Step 5: Gradually fold the dry ingredients into the wet ingredients until a soft dough forms.
Step 6: Stir in the chocolate chips and chopped dark chocolate evenly throughout the dough.
Step 7: Scoop large portions of dough onto the prepared baking sheets, spacing them apart.
Step 8: Bake for 10 to 13 minutes until the edges are golden but the centers remain soft.
Step 9: Immediately sprinkle flaky sea salt over the warm cookies.
Step 10: Allow the cookies to cool on the baking sheet for 5 minutes before transferring to a wire rack.
Storage and Reheating Tips
Store the cookies in an airtight container at room temperature for up to 5 days.
To keep them extra soft, place a slice of bread in the container with the cookies.
Reheat cookies in the microwave for 10 to 15 seconds for a warm, gooey texture.
Cookie dough can also be frozen for up to 3 months and baked directly from frozen with an extra 1 to 2 minutes of baking time.
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