1Preheat oven to 350°F (180°C). Line a baking sheet with parchment paper.
2Preheat oven to 350°F (180°C). Line a baking sheet with parchment paper.
3Preheat oven to 350°F (180°C). Line a baking sheet with parchment paper.
4Whisk together flour, baking powder, baking soda, and cornstarch in a medium bowl. Set aside.
5Whisk together flour, baking powder, baking soda, and cornstarch in a medium bowl. Set aside.
6Whisk together flour, baking powder, baking soda, and cornstarch in a medium bowl. Set aside.
7Cream together brown sugar, granulated sugar, and butter in a large bowl using an electric mixer until light and fluffy.
8Cream together brown sugar, granulated sugar, and butter in a large bowl using an electric mixer until light and fluffy.
9Cream together brown sugar, granulated sugar, and butter in a large bowl using an electric mixer until light and fluffy.
10Beat in eggs one at a time, followed by vanilla extract and salt. Beat for 3-4 minutes until pale and sugar is well incorporated.
11Beat in eggs one at a time, followed by vanilla extract and salt. Beat for 3-4 minutes until pale and sugar is well incorporated.
12Beat in eggs one at a time, followed by vanilla extract and salt. Beat for 3-4 minutes until pale and sugar is well incorporated.
13Gradually mix in the dry ingredients until just combined; do not overmix.
14Gradually mix in the dry ingredients until just combined; do not overmix.
15Gradually mix in the dry ingredients until just combined; do not overmix.
16Stir in chocolate chips and walnuts.
17Stir in chocolate chips and walnuts.
18Stir in chocolate chips and walnuts.
19Scoop 2 tablespoon-sized balls of dough onto the prepared baking sheet, leaving about 4 inches between each cookie. Top with more chocolate chips and walnuts.
20Scoop 2 tablespoon-sized balls of dough onto the prepared baking sheet, leaving about 4 inches between each cookie. Top with more chocolate chips and walnuts.
21Scoop 2 tablespoon-sized balls of dough onto the prepared baking sheet, leaving about 4 inches between each cookie. Top with more chocolate chips and walnuts.
22Bake for 13-16 minutes, or until edges are lightly golden brown.
23Bake for 13-16 minutes, or until edges are lightly golden brown.
24Bake for 13-16 minutes, or until edges are lightly golden brown.
25Remove from oven and let cool on baking sheet for 5 minutes before transferring to a wire rack to cool completely.
26Remove from oven and let cool on baking sheet for 5 minutes before transferring to a wire rack to cool completely.
27Remove from oven and let cool on baking sheet for 5 minutes before transferring to a wire rack to cool completely.