Halloween Monster Mash Cookies

Ingredients

• 2 sticks (1 cup) salted butter, at room temperature
• 1 cup dark brown sugar
• 1/3 cup light brown sugar (or more dark brown)
• 2 large eggs, plus 1 egg yolk
• 1 tbsp vanilla extract
• 2 cups all-purpose flour
• 2 tsp baking soda
• 2 tsp baking powder
• 1/2 tsp kosher salt
• 2 cups old fashioned oats
• 1 & 1/4 cups Halloween M&M’s
• 1 cup mini pretzel sticks, crushed
• 1 cup semi-sweet chocolate chips or chunks
• candy eyes