Add all the base ingredients to a bowl and mix until the dough is smooth.
Grease a microwave-safe mug (or ramekin) with cooking oil or butter. Pour the batter into the mug.
Microwave for 80-90 seconds (1000W microwave).
Now let’s make the topping. Chop the pecans and add them to a pot with the other topping ingredients. Cook on low heat until the butter melts and everything is mixed.
Add the topping on top of the mug cake. Enjoy this keto pecan pie mug cake!