30 ml Unsalted butter (melted)Life hack if you forgot to melt the butter at room temperature: put the butter in a glass and put it in a bowl of hot water to melt it.
Add all ingredients to a large bowl in the order shown in the ingredients list. Mix the ingredients between each addition. So after you have added the butter to the egg mix it with a whisk/chopstick/fork and so on.
Preheat oven at 180 Celsius degrees.
Prepare the muffin cups and use a spoon to add the batter to the muffin cups.
Put them in the preheated oven (180 Celsius degrees) for 20-25 minutes. You can test whether the muffins are ready by putting a toothpick in the muffin. When you take it out, the toothpick should be clean with only small crumbly bits.