Whisk eggs, sugar, and brown sugar until fluffy.
Fold in remaining ingredients and distribute the batter into muffin cups.
Bake for 20 minutes at 200 degrees Celsius (392 degrees Fahrenheit).
Meanwhile, you can make the frosting; whisk butter, powdered sugar, and lemon juice into a cohesive mixture.
Fold in the cream cheese with a spatula to a fine, creamy frosting.
Distribute on the muffins once they have cooled...
Optionally, top with some chopped almonds and pistachios.
Enjoy! ?