Preheat your oven to 350°F (180°C) while preparing the batter.
In a large bowl, whisk together the flour, sugar, baking powder, salt, and vanilla sugar.
In a separate bowl, whisk the eggs, then add the oil and milk. Mix until smooth.
Gradually add the wet ingredients to the dry ingredients, mixing until you have a smooth, lump-free batter.
Divide the batter into four equal portions, then add a different food coloring to each portion.
Layer the different colored batters into muffin liners to create a rainbow effect.
Bake the cupcakes for 20-25 minutes, or until golden brown and a toothpick inserted into the center comes out clean.
Allow the cupcakes to cool completely before frosting.
Whip the heavy cream until stiff peaks form, then gently fold in the powdered sugar. Divide the frosting into four portions and add a different food coloring to each.
Layer the colored frostings into a piping bag, then pipe onto the cupcakes to create a rainbow effect.
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