Easy Christmas Cookie Bars - Perfect for Holiday Platters - Quickie Recipe

Ingredients

• 3/4 cup unsalted butter (1 1/2 sticks), melted.
• 3/4 cup light brown sugar.
• 1/2 cup granulated sugar.
• 1 large egg plus 1 egg yolk.
• 2 teaspoons vanilla extract.
• 1 teaspoon baking soda.
• 1/4 teaspoon baking powder.
• 1/2 teaspoon salt.
• 2 cups all-purpose flour.
• 1/2 cup semi-sweet chocolate chips.
• 1/2 cup red and green M&Ms.
• 1/2 cup broken pretzels.
• 1/2 cup chopped chewy caramels.
• 2 tablespoons holiday sprinkles.