Chocolate Caramel Mug Cake

Name: Chocolate Caramel Mug Cake
Prep time: 5 min
Cook time: 1 min
Total time: 6 min
Cuisine: European
Ingredients: 2 Tbsp. butter (melted); 4 Tbsp. granulated sugar; 3 Tbsp. unsweetened cocoa powder; 1/4 tsp. ground cinnamon; 1/4 tsp. baking powder; 1 medium egg (beaten); 3 Tbsp. whole milk; 4 Tbsp. all-purpose flour; 6 small caramel squares (chopped into small pieces); 3 Tbsp. semisweet chocolate chips; Confectioner's sugar for sprinkling (optional)