Christmas Kitchen Sink Cookies (Chewy Sweet and Salty Holiday Cookies) - My Home Made Recipe

Ingredients

• 1 cup (226 g) unsalted butter, softened
• 3/4 cup (150 g) packed light brown sugar
• 1/2 cup (100 g) granulated sugar
• 2 large eggs, room temperature
• 2 teaspoons vanilla extract
• 2 3/4 cups (330 g) all-purpose flour
• 1 tablespoon cornstarch
• 1 teaspoon baking soda
• 1/2 teaspoon baking powder
• 3/4 teaspoon kosher salt
• 3/4 cup (150 g) red and green M&Ms, plus more for topping
• 1/2 cup (85 g) semisweet chocolate chips
• 1/2 cup (85 g) white chocolate chips
• 1/2 cup (25 g) mini pretzels, roughly broken
• 1/2 cup (20 g) ridged potato chips, lightly crushed
• 1/3 cup (55 g) toffee bits
• 2 tablespoons holiday sprinkles
• Flaky sea salt, for finishing