Preheat the air fryer to 320 degrees F using the air fryer setting. Place the cupcake sheets into muffin molds.
Mix the egg, sugar, yogurt, buttermilk, vegetable oil, and vanilla extract in a large bowl. Sift the flour, cocoa powder, pinch of salt, and baking soda. Add the dry ingredients to the mixture and stir with a spatula (do not over-mix!)
Add the gel red food coloring little by little. Divide the mixture into the cupcake sheets.
Bake for 10-12 minutes, in the air fryer, at 320 degrees F, using the air fryer setting. Before removing the cupcakes from the air fryer, test them with a toothpick or a knife. If the middle is dry, take it out from the air fryer.
Rest for 15 minutes to cool down before decorating.
Beat the softened butter, vanilla extract, and cream cheese until it gets smooth. Add the powdered sugar and whisk for 3 minutes. Then, take the frosting to the piping bag and decorate them as you wish. Keep it in the refrigerator.
oak gelatins in cold water for 5 minutes. Squeeze the excess water of gelatins and put them in a saucepan. Pour 5 tbsp of cold water over it. Stir on the stove until it melts (do not overheat!) Inflate the balloons. Cover all balloons with gelatin. Let it dry for 10 minutes. Then, cover all the balloons again. Let it dry for 24 hours. After it dried, pop the balloons and remove them from the gelatins. Decorate the colorful marzipans as you wish. Combine all the decorations with the cupcakes.