Christmas M&M Cookie Bars - Recipe Top

Ingredients

• 3/4 cup unsalted butter, melted and cooled (170g)
• 1/2 cup light brown sugar, packed (100g)
• 1/4 cup granulated cane sugar or monkfruit (50g)
• 1 large egg, room temperature
• 1 large egg yolk, room temperature
• 1 tablespoon vanilla extract
• 2 1/4 cups all-purpose flour (280g)
• 2 teaspoons cornstarch
• 1/2 teaspoon baking soda
• 1/2 teaspoon sea salt
• 1 cup Christmas M&Ms, divided
• 1/2 cup dark chocolate chips, 70% cacao