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Line 2 baking sheets with parchment paper.

In a separate medium bowl, whisk together the all-purpose flour, cornstarch, baking powder, and baking soda. Set aside.

In the bowl of a stand mixer fitted with the paddle attachment, add the cold salted butter (cut into cubes), packed light brown sugar, and granulated sugar. Mix on medium speed for 1 to 2 minutes until the mixture is crumbly with visible butter pieces, resembling a damp sand texture.

Add the 3 large cold eggs one at a time, mixing briefly after each addition until just combined. Do not overmix.

Mix in the 2 teaspoons of vanilla extract until just incorporated.

Add the whisked dry ingredients to the wet mixture. Mix on low speed just until the dough comes together. The dough will be very thick and dense.

By hand, using a sturdy spatula, fold in the 2 cups of white chocolate chips and 1 cup of rainbow sprinkles until evenly distributed throughout the dough.

Weigh out 6-ounce portions of the dough. Gently press and cup each 6-ounce portion into a rough mound just until it holds together; do not form perfect balls. Each cookie should be approximately 2 1/2 inches wide, 2 1/2 inches tall, and precisely 6 ounces for proper baking.
Place the formed dough portions on the prepared baking sheets. Freeze the dough for at least 2 hours before baking; overnight is even better.

When ready to bake, preheat the oven to 425°F.

Arrange no more than 6 cookies on each parchment-lined baking sheet, ensuring they are spaced well apart.

Bake one sheet at a time on the center rack for 13 to 15 minutes (aim for 14 1/2 minutes for best results). The edges of the cookies should be golden with a slightly lighter center.

Rest the baked cookies on the pan for 10 minutes before carefully transferring them to a wire rack to cool completely.

Line 2 baking sheets with parchment paper.

In a separate medium bowl, whisk together the all-purpose flour, cornstarch, baking powder, and baking soda. Set aside.

In the bowl of a stand mixer fitted with the paddle attachment, add the cold salted butter (cut into cubes), packed light brown sugar, and granulated sugar. Mix on medium speed for 1 to 2 minutes until the mixture is crumbly with visible butter pieces, resembling a damp sand texture.

Add the 3 large cold eggs one at a time, mixing briefly after each addition until just combined. Do not overmix.

Mix in the 2 teaspoons of vanilla extract until just incorporated.

Add the whisked dry ingredients to the wet mixture. Mix on low speed just until the dough comes together. The dough will be very thick and dense.

By hand, using a sturdy spatula, fold in the 2 cups of white chocolate chips and 1 cup of rainbow sprinkles until evenly distributed throughout the dough.

Weigh out 6-ounce portions of the dough. Gently press and cup each 6-ounce portion into a rough mound just until it holds together; do not form perfect balls. Each cookie should be approximately 2 1/2 inches wide, 2 1/2 inches tall, and precisely 6 ounces for proper baking.
Place the formed dough portions on the prepared baking sheets. Freeze the dough for at least 2 hours before baking; overnight is even better.

When ready to bake, preheat the oven to 425°F.

Arrange no more than 6 cookies on each parchment-lined baking sheet, ensuring they are spaced well apart.

Bake one sheet at a time on the center rack for 13 to 15 minutes (aim for 14 1/2 minutes for best results). The edges of the cookies should be golden with a slightly lighter center.

Rest the baked cookies on the pan for 10 minutes before carefully transferring them to a wire rack to cool completely.