Chewy Christmas Snickerdoodles

Bahan-bahan (20 porsi)

• 2 sticks (1 cup) salted butter, at room temperature
• 3/4 cup light or dark brown sugar
• 2 large eggs, plus 1 egg yolk
• 2 teaspoons vanilla extract
• 2 1/4 cups all-purpose flour
• 1 teaspoon baking soda
• 1 teaspoon kosher salt
• 1 1/4 cups holiday M&M’s
• 1 cup mini pretzel sticks crushed
• 1 cup semi-sweet chocolate chips
• 1/3 cup dark chocolate chunks
• 1/3 cup granulated sugar
• 2 teaspoons cinnamon