Step 1
Combine milk and vinegar in a bowl. Let stand until milk curdles about 5 minutes.
Step 2
Preheat oven to 350 degrees F (175 degrees C). Grease a 24-cup mini muffin tin or line cups with paper liners.
Step 3
Combine 1/2 cup butter white sugar and vanilla sugar in a large bowl; beat with an electric mixer until smooth and creamy. Add eggs one at a time beating well after each addition.
Step 4
Mix 3/4 cup plus 1 tablespoon flour cocoa powder baking powder baking soda and salt in a bowl. Alternate adding flour mixture and curdled milk to the creamed butter mixture mixing until batter is well blended. Spoon batter into the prepared muffin cups filling each 3/4 full.
Step 5
Bake in the preheated oven until tops spring back when lightly pressed and a toothpick inserted in the center of 1 cupcake comes back clean about 14 minutes. Cool in the muffin tin for a few minutes then transfer to a wire rack to cool completely about 1 hour.
Step 6
Combine cream cheese and 1/4 cup butter in a bowl; beat with an electric mixer until well combined. Mix in vanilla extract. Stir in confectioners' sugar gradually. Color frosting orange with a few drops of food coloring.
Step 7
Place orange frosting in a pastry bag fitted with a grass tip. Hold the pastry bag at a 90-degree angle 1/8 inch above the surface of a cupcake. Squeeze bag to form orange 'fur' by pulling tip up and away when the icing strand is about 1/2 inch high. Repeat to cover cupcake evenly with fur.
Step 8
Add 2 eyes to each cupcake. Cut dried mango into small strips and arrange into the frosting as 'horns'.