Halloween “Oreos”

Name: Halloween “Oreos”
Prep time: 20 min
Cook time: 45 min
Total time: 1 h 5 min
Cuisine: American
Ingredients: 10 Tbsp unsalted butter; 1 cup all purpose flour; 1/2 cup cocoa powder (dutch process is best!); 1 tsp baking soda; 1/2 tsp kosher salt; 1/4 tsp baking powder; 1 1/2 cups sugar; 1 egg; 1 tsp vanilla bean paste (or extract); Cream; 2 sticks (8 oz) unsalted butter, very soft; 2 cups powdered sugar; 1 tsp vanilla bean paste (or extract); 1/4 tsp kosher salt; Zest of an orange (optional); Orange gel food color