Melt the Unsalted Butter (7 tablespoon) and let it cool down.
Place Egg (2) in a measuring cup.
Add Vanilla Extract (1 teaspoon) to the eggs, and beat them up a bit.
Slowly pour in the melted and cooled butter.
Combine All-Purpose Flour (140 gram), Granulated Sugar (1/2 cup) and Baking Powder (1 tablespoon) in the bowl of the electric mixer.
Set the mixer at low and give it a light stir.
Slowly pour in the eggs/butter mixture and Milk (2 tablespoon).
Mix on medium speed for a few minutes, scraping down sides of the bowl from time to time.
Place the batter in three bowls.
Pour a few drops of Red Food Coloring (to taste) in one of the bowls.
Next pour a few drops of Blue Food Coloring (to taste) in another bowl.
Put 1 tablespoon of the blue batter in each muffin cup.
Then add the white batter, and spread with a toothpick.
Then add the red batter on top.
Bake at 350 degrees F (180 degrees C) for about 15 minutes.
Take them out of the oven, let them cool down and serve.