First Step
Beat up 1/2 cup of butter and 1 cup of sugar
Second Step
Add the egg and whisk it very well.
Third Step
Add 2/3 cup of milk and 1 tsp of vanilla. whisk it until it is nicely combined.
Fourth Step
Add 1 cup of all-purpose flour and 1 cup of self-rising flour. Whisk it perfectly.
Fifth Step
Grab a muffin tin. Fill the tin with batter until 3/4 of it.
Sixth Step
Bake it in a preheated oven at 180° during 25 minutes. Finished! Now you have some awesome vanilla muffins!