Bah Humbug Cookies - Rachel Tritsch

Ingredients

• 1/2 cup unsalted butter, softened
• 1/2 cup brown sugar
• 1 egg
• 1 tbsp vanilla extract
• 2 tsp green gel food coloring
• 1 1/4 cup flour
• 1/2 tsp baking powder
• 1/4 tsp salt
• 1 tbsp cocoa
• green sanding sugar
• large marshmallows, halved
• Hershey's kisses