Sieve flour, sugar, baking powder, baking soda, salt and coco powder into mixing bowl and mix it well.
Add milk gradually and mix it well.
Add oil, vanilla extract, mix it well and make runny batter (add more milk if required).
Now grease the microwave safe mold (glass or plastic), pour the prepared batter and fill the mold ¾, place the peanut butter + chocolate into the center.
Place the filled mold into the microwave and bake it on high power level for 1 to 1.30 minutes.
Remove it from the microwave and let it be cool down little bit.
Transfer it into the serving plate, molten lava cake is ready.
Serve it fresh, or you can serve it with ice cream and enjoy the moment...