Microwave mug brownie Take 2

Since my first attempt here, I've found 2 new recipes and itching to try both. I didn't like using baking powder in lieu of the self-raising flour, so these 2 recipes are an improvement because they use neither.

1) 1 minute only, uses butter: http://www.taste.com.au/kitchen/recipes/1+minute+microwave+chocolate+brownie+in+a+mug,33030

2) 1 to 2 minutes, uses oil: http://www.simplyrecipes.com/recipes/brownie_in_a_mug/

Arguably, butter is going to taste much nicer than oil but there isn't any reason why I can't replace the oil with the butter. Other than that, the 2 recipes are largely similar except #2 adds cinnamon and #1 adds starts with wet and adds dry but #2 starts with dry and adds wet. Apparently, it's always better to mix both separately then add wet to dry to prevent it becoming a claggy, lumpy mess but that's more than 1 mug's work, so I'll settle for mixing dry, then creating a well in the centre and adding wet.

Oh and I need to use milk instead of water this time!

Updated 22 Feb 2015: Tried to combine the recipes by using melted butter and adding an egg to make it more spongy. It turned out strange, like eating kueh after a minute. Will probably not try adding the egg. Not very palatable.

Updated 23 Feb 2015: Tried the first recipe again in its entirety. Turned out so dry, I even had to add another tbsp of water to wet all the dry ingredients! After cooking in the microwave on high for 1 minute, it was ready but felt like eating sweet chocolate flour. Dry. Not trying again.