Easy Peasy Marble cake

Al's Marble Cake (with 9 ingredients that you most likely have at home)

150gm butter
150 gm sugar ( i use about 3/4 mug, like it less sweet)
mix well
add 3 eggs
add vanilla essense about 2 tsp i use dry kind about half tsp
mix
sift in about 350gm cake flour (about 2 mugs full), 2 tsp baking powder, half tsp salt, alternate with half cup fresh milk
preheat oven to 200C
line loaf tin/ rectangle tray, spread half the mixture in it
add 2.5 tbsp cocoa powder into remaining mixture with 3 tbsp of milk, mix well
add that into pan, just make sure you have some cocoa parts all over the top and use a knife to swirl it around a bit, dont mix too much just make sure there will be a bit of light and dark in every piece later on.
put pan into oven - lower half of the oven as the top tends to brown a bit too fast.
turn heat to about 180C, bake about 45-55 mins, check at 30 mins, if top is browning too fast, just lightly cover top with foil
insert knife in center of cake right to the bottom, if it comes out clean, should be done... try a few spots... i baked mine for 40 mins and did the test and had to put it back another 15..... so depending on your oven really.
remove and let it rest awhile... be careful when removing the cake, layers may tend to separate when you flip it over ( i didnt line my pan, which i will have to do next time)
Tastes better when its cooled down at least 30 mins.
Loved the slightly crunchy texture of the sides and top.