Who can resist a warm, gooey chocolate chip cookie? Here's the recipe:

Ingredients:

1. 1/2 cup unsalted butter (softened)
2. 3/4 cup packed light brown sugar
3. 1/4 cup granulated sugar
4. 1 large egg
5. 1 tablespoon pure vanilla extract
6. 2 cups all-purpose flour
7. 2 tablespoons cornstarch
8. 1 teaspoon baking powder
9. 1/2 teaspoon baking soda
10. 1/2 teaspoon salt
11. 12 ounces semi-sweet chocolate chips
12. 1/2 cup walnut pieces (optional)

Instructions:

1. Preheat oven to 375°F (190°C). Line a baking sheet with parchment paper.
2. In a large bowl, cream together butter and sugars until light and fluffy.

3. Beat in the egg and vanilla extract until well combined.
4. In a separate bowl, whisk together flour, cornstarch, baking powder, baking soda, and salt.
5. Gradually add the dry ingredients to the wet ingredients, mixing until just combined.
6. Stir in chocolate chips and walnut pieces (if using).
7. Scoop tablespoon-sized balls of dough onto the prepared baking sheet, leaving 2 inches of space between each cookie.
8. Bake for 10-12 minutes or until edges are lightly golden brown.
9. Remove from oven and let cool on the baking sheet for 5 minutes before transferring to a wire rack to cool completely.

Tips:

- Use high-quality chocolate chips for the best flavor.
- If you want a chewier cookie, bake for 8-10 minutes. If you prefer a crisper cookie, bake for 12-14 minutes.
- Consider adding a sprinkle of sea salt on top of the cookies before baking for an extra burst of flavor.