Make the streusel by combining all the streusel ingredients into a small bowl.
In a mug, add vegetable oil, sugar and mix well. Then add the vanilla extract, the star ingredient “chocolate peanut butter”, yogurt and mix well.
Now add the flour, cinnamon, baking soda, salt to it. Mix all well.
Top it with the streusel.
Microwave for 2 minutes on high. Start checking from 1 minute 20 seconds. Mine was done exactly at 1 Minute 30 seconds. Even keeping in microwave for long can turn it rubbery.
Recipe by Relish The Bite at https://www.relishthebite.com/2-minute-chocolate-peanut-butter-crumb-mug-cake/