Kue Potongan Coklat Malt Mentega Coklat

Bahan-bahan (24 porsi)

• 2 sticks (1 cup) salted butter, at room temperature
• 3/4 cup light or dark brown sugar
• 1/4 cup granulated sugar
• 2 large eggs, at room temperature
• 2 teaspoons vanilla extract
• 2 cups all-purpose flour
• 1/2 cup malted milk powder
• 3/4 teaspoon baking soda
• 1/2 teaspoon kosher salt
• 1 1/2 cups chopped chocolate chunks or chips
• flaky sea salt, for sprinkling ((if desired))