In your favorite microwave-safe mug, mix together the all-purpose flour, baking powder, kosher salt, and sugar until well combined.
Add the coconut oil, honey, and milk to the dry mixture. Stir well with a fork or whisk until you have a smooth batter.
Gently fold in the fresh blueberries, being careful not to mash them.
Place the mug in the microwave and cook on high for about 1 minute and 30 seconds.
Once cooked, allow it to cool for a minute or two, then enjoy your Muffin In A Mug straight from the mug or transfer it to a plate.
